US3855000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air depolarization primary cell and process for production thereof
Assignee: SAFT Societe des Accumulateurs Fixes et de Traction SA
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Filing: 1972-10-26
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Granted: 1974-12-17
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Expires: 1992-10-26
Abstract
Abstract Air depolarization type electric cell comprising positive and negative electrodes and an electrolyte within a container. The said container is closed in fluid-tight manner. A free space within the container permits the expansion of the negative electrode without movement of the electrolyte. The process of manufacture of such cells is also recited.
Inventors
- 👤 J Jammet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:28
CPC Classifications
H; H01; H01M; H01M12/00; H01M12/04; H01M12/06
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
216 words
AN AIR DEPOLARIZATION UNITARY PRIMARY CELL OF THE TYPE COMPRISING A TUULAR CASING OF NON-CONDUCTIVE MATERIAL, A POROUS POSITIVE ELECTRODE, AN IMMOBILIZED ALKALINE ELECTROLYTE AND AN EXPANDIBLE NEGATIVE ELECTROCE BASE ON ZINC ARRANGED IN SUPERPOSED LAYERS AND DISPOSED IN SAID TUBULAR CASING, ALL OF SAID LAYERS EXTENDING TRANSVERSELT OF THE LONGITUDINAL AXIS OF SAID CASING, MEAS FOR SEALING SAID CELL IN FLUID-TIGHT MANNER RELATIVE TO LIQUIDS WITHIN THE CELL AT ONE END THEREOF, SAID MEANS COMPRISING A HYDROPHOBIC IMPREGNANT IN PORES OF SAID POSITIVE ELECTRODE, SAID POSITIVE ELECTRODE BEING ADHESIVELY SECURED IN SAID CONTAINER ADJACENT SAID ONE END, SAID ONE END HAVING AT LEAST ONE OPENING FOR PROVIDING ACCESS OF AIR TO THE POSITIVE ELECTRODE WHILE BLOCKING EXIT OF SAID LIQUIDS VIA SAID POSITIVE ELECTRODE, MEANS AT THE OPPOSITE END OF SAID CASING INCLUSING A COVER CARRYING A NEGATIVE TERMINAL, MEANS CONNECTING SAID TERMINAL WITH SAID NEGATIVE ELECTRODE, SAID COVER BEING SECURELY SEALED TO SAID CASING AT SAID OPPOSITE END, SAID LAYERS BEING DISPOSED IN SAID CASING TO PROVIDE A SPACE FOR EXPANSION OF THE NEGATIVE ELECTRODE BETWEEN THE LATTER AND THE COVER, MEANS WITHIN SAID SPACE BETWEEN SAID COVER AND SAID NEGATIVE ELECTRODE TO MAINTAIN SAID LAYERS UNDER PRESSURE AND IN INTIMATE SURFACE CONTACT IRRESPECTIVE EXPANSION OF THE NEGATIVE ELECTRODE DURING USE OF THE CELL.
Claim 2
Dependent Claim
216 words
AN AIR DEPOLARIZATION UNITARY PRIMARY CELL OF THE TYPE COMPRISING A TUULAR CASING OF NON-CONDUCTIVE MATERIAL, A POROUS POSITIVE ELECTRODE, AN IMMOBILIZED ALKALINE ELECTROLYTE AND AN EXPANDIBLE NEGATIVE ELECTROCE BASE ON ZINC ARRANGED IN SUPERPOSED LAYERS AND DISPOSED IN SAID TUBULAR CASING, ALL OF SAID LAYERS EXTENDING TRANSVERSELT OF THE LONGITUDINAL AXIS OF SAID CASING, MEAS FOR SEALING SAID CELL IN FLUID-TIGHT MANNER RELATIVE TO LIQUIDS WITHIN THE CELL AT ONE END THEREOF, SAID MEANS COMPRISING A HYDROPHOBIC IMPREGNANT IN PORES OF SAID POSITIVE ELECTRODE, SAID POSITIVE ELECTRODE BEING ADHESIVELY SECURED IN SAID CONTAINER ADJACENT SAID ONE END, SAID ONE END HAVING AT LEAST ONE OPENING FOR PROVIDING ACCESS OF AIR TO THE POSITIVE ELECTRODE WHILE BLOCKING EXIT OF SAID LIQUIDS VIA SAID POSITIVE ELECTRODE, MEANS AT THE OPPOSITE END OF SAID CASING INCLUSING A COVER CARRYING A NEGATIVE TERMINAL, MEANS CONNECTING SAID TERMINAL WITH SAID NEGATIVE ELECTRODE, SAID COVER BEING SECURELY SEALED TO SAID CASING AT SAID OPPOSITE END, SAID LAYERS BEING DISPOSED IN SAID CASING TO PROVIDE A SPACE FOR EXPANSION OF THE NEGATIVE ELECTRODE BETWEEN THE LATTER AND THE COVER, MEANS WITHIN SAID SPACE BETWEEN SAID COVER AND SAID NEGATIVE ELECTRODE TO MAINTAIN SAID LAYERS UNDER PRESSURE AND IN INTIMATE SURFACE CONTACT IRRESPECTIVE EXPANSION OF THE NEGATIVE ELECTRODE DURING USE OF THE CELL.
Claim 3
Dependent Claim
34 words
Primary cell according to claim 1, wherein said last-named means comprises a compressible porous layer of material in said space and extending transversely of the axis of said casing which resists attack by electrolyte.
Claim 4
Dependent Claim
13 words
Primary cell according to claim 2, wherein said material is a synthetic material.
Claim 5
Dependent Claim
42 words
Primary cell according to claim 1, wherein said last-named means comprises a plate-like member in surface contact with the negative electrode and a spring in said space between said plate-like member and said cover for biasing said plate-like member into such contact.
Claim 6
Dependent Claim
35 words
Primary cell according to claim 1, wherein said last-named means comprises a piston extending transversely of the axis of said casing and frictionally slidable in the casing and in surface contact with said negative electrode.
Claim 7
Dependent Claim
21 words
Primary cell according to claim 1 wherein said negative electrode comprises a layer of pulverulent zinc in suspension in a gel.
Claim 8
Dependent Claim
20 words
Primary cell according to claim 1 wherein the electrolyte is a solution of potassium hydroxide mixed with a gelling agent.
Claim 9
Dependent Claim
23 words
Primary cell according to claim 1 wherein said positive electrode comprises a hydrophobic porous plate adhesively secured at its periphery to the casing.
Claim 10
Dependent Claim
40 words
Primary cell according to claim 8, wherein the pores of an impregnant of porous plate are rendered hydrophobic by the material similar to that of the casing, and wherein the adhesive securing said plate to the casing contains like material.
Claim 11
Dependent Claim
20 words
Primary cell according to claim 9 wherein the said material is selected from the group consisting of polystyrene and polymethacrylate.
Claim 12
Dependent Claim
43 words
Primary cell according to claim 1 including a negative terminal at said cover prolonged towards the interior of the casing through which said terminal extends, a fluid-tight packing, and a current collector in contact with the negative electrode and connected to said terminal.
Claim 13
Dependent Claim
21 words
Primary cell according to claim 11 wherein said negative terminal is electrically connected with said current collector contacting the negative electrode.
Claim 14
Dependent Claim
24 words
Primary cell according to claim 11 wherein the collector projects from the inner face of the cover and is engaged in the negative electrode.
Claim 15
Dependent Claim
24 words
Primary cell according to claim 12 wherein the collector comprises a plate disposed between the negative electrode and an expansion space in said cell.
Claim 16
Dependent Claim
188 words
Process for the manufacture of an air depolarization primary cell comprising providing a tubular container havIng a ledge adjacent one end, applying adhesive to said ledge then placing a positive hydrophobic porous electrode in position on said ledge of said container so as to extend transversely of the axis of said container and to be secured to said ledge by said adhesive, then applying a settable resinous packing between the periphery of said porous positive electrode and the inner wall of said container, allowing said packing to set and harden, then pouring a gellatinized electrolyte on the positive electrode to form a layer extending transversely of the axis of said casing, then covering said electrolyte layer with a negative electrode also extending transversely of the axis of the container, then providing compressible means in said casing overlying said negative electrode to maintain pressure contact between the electrodes and the electrolyte irrespective of the expansion of the negative electrode, then assembling a cover with the container in fluid tight manner and spaced from said negative electrode thus defining an expansion space therebetween in which said compressible means is confined.
Claim 17
Dependent Claim
188 words
Process for the manufacture of an air depolarization primary cell comprising providing a tubular container havIng a ledge adjacent one end, applying adhesive to said ledge then placing a positive hydrophobic porous electrode in position on said ledge of said container so as to extend transversely of the axis of said container and to be secured to said ledge by said adhesive, then applying a settable resinous packing between the periphery of said porous positive electrode and the inner wall of said container, allowing said packing to set and harden, then pouring a gellatinized electrolyte on the positive electrode to form a layer extending transversely of the axis of said casing, then covering said electrolyte layer with a negative electrode also extending transversely of the axis of the container, then providing compressible means in said casing overlying said negative electrode to maintain pressure contact between the electrodes and the electrolyte irrespective of the expansion of the negative electrode, then assembling a cover with the container in fluid tight manner and spaced from said negative electrode thus defining an expansion space therebetween in which said compressible means is confined.
Claim 18
Dependent Claim
69 words
Process for the manufacture of an air depolarization primary cell according to claim 15 wherein first the positive electrode is disposed and positioned in said container, then the electrolyte is poured on to the positive electrode, then covering the electrolyte by the said negative electrode, then inserting means for maintaining a state of compression of said negative electrode, and finally the assembling cover in fluid-tight manner with said container.
Claim 19
Dependent Claim
35 words
Process according to claim 15 wherein before introducing the positive electrode into said casing adhesive is applied to a zone of the inner surface of the container with which said positive electrode will make contact.
Claim 20
Dependent Claim
56 words
Process according to claim 15 wherein the electrolyte is poured onto said positive electrode at a temperature lower than ambient temperature, but whose viscosity is sufficiently low to permit it to settle on said positive electrode and spread out thereover in a uniform layer free of bubbles which extends transversely of the axis of said container.
Claim 21
Dependent Claim
13 words
Process according to claim 18, wherein the said temperature is lower than 0*C.
Claim 22
Dependent Claim
172 words
An air depolarization primary cell of the type comprising a tubular casing of synthetic nonconductive material, a positive electrode, an immobilized alkaline electrolyte and an expandible negative electrode arranged in superposed layers all disposed transversely of the axis of said casing, a cover spaced from the negative electrode layer and closing one end of the casing, yieldable means for maintaining said negative electrode in a state of compression and in pressure contact with said electrolyte irrespective of expansion of said negative electrode, said means being located in the space within said casing between the negative electrode and said cover, a terminal in said cover, means for connecting said terminal to said negative electrode, means for providing a fluid-tight seal between said cover and said container, said positive electrode being porous and hydrophobic, means for admitting air to said casing only via pores of said positive electrode, and adhesive means for preventing displacement of said positive electrode within said casing during use of said cell and any resultant expansion of said negative electrode.
Claim 23
Dependent Claim
172 words
An air depolarization primary cell of the type comprising a tubular casing of synthetic nonconductive material, a positive electrode, an immobilized alkaline electrolyte and an expandible negative electrode arranged in superposed layers all disposed transversely of the axis of said casing, a cover spaced from the negative electrode layer and closing one end of the casing, yieldable means for maintaining said negative electrode in a state of compression and in pressure contact with said electrolyte irrespective of expansion of said negative electrode, said means being located in the space within said casing between the negative electrode and said cover, a terminal in said cover, means for connecting said terminal to said negative electrode, means for providing a fluid-tight seal between said cover and said container, said positive electrode being porous and hydrophobic, means for admitting air to said casing only via pores of said positive electrode, and adhesive means for preventing displacement of said positive electrode within said casing during use of said cell and any resultant expansion of said negative electrode.
Claim 24
Dependent Claim
18 words
Primary cell according to claim 20 wherein said negative electrode comprises pulverulent zinc in suspension in a gel.
Claim 25
Dependent Claim
16 words
Primary cell according to claim 20 wherein said positive electrode is of active carbon rendered hydrophobic.
Claim 26
Dependent Claim
21 words
Primary cell according to claim 20 wherein said alkaline electrolyte is a solution of potassium hydroxide mixed with a gelling agent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |