US4965147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separator for an electrochemical cell of the metal-air type and having an alkaline electrolyte
Assignee: Compagnie Industrielle des Piles Electriques CIPEL SA
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Filing: 1989-07-17
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Granted: 1990-10-23
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Expires: 2009-07-17
Abstract
Abstract A separator for an electrochemical primary cell of the metal-air type and having an alkaline electrolyte comprises a support based on woven or non-woven fibers, with at least one of the faces of the support being provided with a film of polyvinyl alcohol is insoluble in the alkaline medium.
Inventors
- 👤 Jean-Claude Mas
- 👤 Andre Mendiboure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:40
CPC Classifications
H; H01; H01M; H01M12/00; H01M12/04; H01M12/06; H01M50/00; H01M50/40; H01M50/409; H01M50/449; H01M50/454; H01M50/489; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
An improved composite separator, for use in an electrochemical primary cell of the metal-air type having an alkaline electrolyte, including a support constituted by woven or non-woven fibers and at least one film of moderately cross-linked polyvinyl alcohol forming a lattice, the improvement consisting in selecting the structure and materials of said composite separator so that: said film has a very low permeability to the diffusion of dissolved oxygen; said separator absorbs between 150 g.m -2 and 300 g.m -2 of 8.5N potassium hydroxide electrolyte solution, said solution being imprisoned in the polyvinyl alcohol lattice without the possibility of hydrodynamic exchange with the rest of said cell; and said separator has an electrolytic resistance in the range of 0 mΩ.cm -2 and 2 mΩ.cm -2 , and a thickness of less than 0.2 mm.
Claim 2
Dependent Claim
134 words
An improved composite separator, for use in an electrochemical primary cell of the metal-air type having an alkaline electrolyte, including a support constituted by woven or non-woven fibers and at least one film of moderately cross-linked polyvinyl alcohol forming a lattice, the improvement consisting in selecting the structure and materials of said composite separator so that: said film has a very low permeability to the diffusion of dissolved oxygen; said separator absorbs between 150 g.m -2 and 300 g.m -2 of 8.5N potassium hydroxide electrolyte solution, said solution being imprisoned in the polyvinyl alcohol lattice without the possibility of hydrodynamic exchange with the rest of said cell; and said separator has an electrolytic resistance in the range of 0 mΩ.cm -2 and 2 mΩ.cm -2 , and a thickness of less than 0.2 mm.
Claim 3
Dependent Claim
21 words
A separator according to claim 1, wherein the thickness of said film lies in the range 25 microns to 60 microns.
Claim 4
Dependent Claim
18 words
A separator according to claim 1, having a thickness lying in the range 100 microns to 200 microns.
Claim 5
Dependent Claim
13 words
A separator according to claim 3, having a thickness of about 150 microns.
Claim 6
Dependent Claim
27 words
A separator according to claim 1, wherein said support is constituted by non-woven fibers selected from the group consisting of: polyamide; polyethylene; cellulose; polyester; polypropylene; and glass.
Claim 7
Dependent Claim
27 words
A separator according to claim 1, wherein said support is constituted by woven fibers selected from the group consisting of: polyamide; polyethylene; cellulose; polyester; polypropylene; and glass.
Claim 8
Dependent Claim
24 words
A separator according to claim 1, constituted by an envelope corresponding to the shape of the electrode to which it is to be associated.
References Cited (Backward Citations)
US3892591A
Cited
US4361632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |