US4049888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrally-activated deferred-action silver-zinc battery
Assignee: SAFT Societe des Accumulateurs Fixes et de Traction SA
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Filing: 1977-01-27
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Granted: 1977-09-20
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Expires: 1997-01-27
Abstract
Abstract A centrally-activated deferred-action silver-zinc battery has a central well defined by a stack of electrodes and separators each having a central hole. Isolating washers are placed around the central holes of each metal sheet and include recesses which provide curved channels for conveying electrolyte from the well towards the electrodes. The restricted cross-section and extended length of these channels ensure a greater electrical resistance to leakage currents which flow between couples via the electrolyte during activation. Pyrotechnic means are provided to activate the battery by rupturing a fragible partition and rapidly forcing electrolyte from an isolated compartment via the rupture in the partition into the well and from thence via the curved channels to spaces provided between electrodes of opposite polarity.
Inventors
- 👤 Jacques Flender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:25
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/30; H01M6/36; H01M6/38; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
211 words
A centrally activated deferred-action battery comprising a stack of couples each constituted by a positive plate and a negative plate and separators each having a central hole forming a central well, means spacing said plates from each other to provide a gap between adjacent facing positive and negative plates for receiving electrolyte, means mechanically separating each couple from the adjacent couple, a metal sheet electrically connecting adjacent couples, said sheet also having a central hole, a first insulating washer with a hole in the center of the washer which is of smaller diameter than the hole in the center of the metal sheet, a second insulating washer cooperating with said first named washer to insulate the inner edge of the said metal sheet, one face of the first washer resting on a said second washer on the adjacent metal sheet and including at least one recess such that the recess together with the said last-named second washer of the adjacent metal sheet forms a channel for conveying electrolyte from the central well to the said gap upon activation of the battery and wherein the recess is so shaped that the channel follows a path which is oblique to the local radial direction of the central hole of said first named washer.
Claim 2
Dependent Claim
211 words
A centrally activated deferred-action battery comprising a stack of couples each constituted by a positive plate and a negative plate and separators each having a central hole forming a central well, means spacing said plates from each other to provide a gap between adjacent facing positive and negative plates for receiving electrolyte, means mechanically separating each couple from the adjacent couple, a metal sheet electrically connecting adjacent couples, said sheet also having a central hole, a first insulating washer with a hole in the center of the washer which is of smaller diameter than the hole in the center of the metal sheet, a second insulating washer cooperating with said first named washer to insulate the inner edge of the said metal sheet, one face of the first washer resting on a said second washer on the adjacent metal sheet and including at least one recess such that the recess together with the said last-named second washer of the adjacent metal sheet forms a channel for conveying electrolyte from the central well to the said gap upon activation of the battery and wherein the recess is so shaped that the channel follows a path which is oblique to the local radial direction of the central hole of said first named washer.
Claim 3
Dependent Claim
12 words
A battery according to claim 1, wherein the said channel is curved.
Claim 4
Dependent Claim
25 words
A battery according to claim 2, wherein the curvature of the channel is directed towards the center of the hole of said first named washer.
Claim 5
Dependent Claim
18 words
A battery according to claim 1, wherein the channel widens out towards the outer edge of the washers.
Claim 6
Dependent Claim
40 words
A battery according to claim 1, wherein the recesses of the first-named washers in the stack have the same angular position so that they are all arranged in the stack along an axis parallel to the axis of the stack.
Claim 7
Dependent Claim
21 words
A battery according to claim 1, including means for fastening the first and second washers of a single metal sheet together.
Claim 8
Dependent Claim
14 words
A battery according to claim 1, wherein the first and second washers are integrated.
Claim 9
Dependent Claim
41 words
A battery according to claim 1, including a sheet of material with adhesive surfaces on both its faces disposed between the recess-bearing surface of each first-named washer and the second-named washer with which it cooperates to fasten the cooperating washers together.
Claim 10
Dependent Claim
98 words
A battery according to claim 1, including a container, a cover therefor, a partition dividing the container and cover into two compartments, a deformable member in one of said compartments, electrolyte confined in said one of said compartments between said deformable member and said partition, and wherein said stack is located in the second of said compartments, said partition having a frangible portion that may be disrupted to permit said electrolyte from said one of said compartments to flow into said central well and via each said channel into each said gap between facing positive and negative plates.
Claim 11
Dependent Claim
45 words
A battery according to claim 9 including means for disrupting the frangible portion of said partition to activate said battery by flow of electrolyte from said one of said compartments into said well and from said well via each said channel into each such gap.
Claim 12
Dependent Claim
39 words
A battery according to claim 10 wherein said means comprises a pyrotechnically operable punch for rupturing said frangible portion and a pyrotechnically operable member for discharging a gas under compression to effect forcible discharge of electrolyte into said well.
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) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |