US4263380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Galvanic element
Assignee: VARTA Batterie AG
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Filing: 1979-08-31
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Granted: 1981-04-21
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Expires: 1999-08-31
Abstract
Abstract A galvanic element of buttom cell configuration is provided, in addition to the usual seal of thermoplastic material between cell terminal and cell cup, with an additional seal. This fills the annular gap which is created when a contact cap surrounding the galvanic element is attached to the cell terminal. The second seal is made, for example, by casting of bitumen or casting resin into the annular gap, shaking in of synthetic plastic powder and subsequent heat treatment for attachment, or by displacement of a heat sensitive glue from the contact cap in response to pressing into the cell. Also, pre-fabricated ceramic rings with metalized surfaces, which are soldered in place betweeen cell cup and contact cap, may be used as the second seal.
Inventors
- 👤 Werner Riedl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:55
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; H01M6/12; H01M50/00; H01M50/10; H01M50/147; H01M50/166; H01M50/167; H01M50/171; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
Galvanic element including a positive electrode, a negative electrode, a separator, an electrolyte, and a housing which is closed in liquid-tight manner by a first seal which simultaneously provides electrical insulation between the cell terminals, said element comprising a contact cap which covers one terminal of the cell, the sealing region, and at least a portion of the second terminal of the cell, and an additional seal which is positioned at least between said covered portion of the second cell terminal and the contact cap.
Claim 2
Dependent Claim
85 words
Galvanic element including a positive electrode, a negative electrode, a separator, an electrolyte, and a housing which is closed in liquid-tight manner by a first seal which simultaneously provides electrical insulation between the cell terminals, said element comprising a contact cap which covers one terminal of the cell, the sealing region, and at least a portion of the second terminal of the cell, and an additional seal which is positioned at least between said covered portion of the second cell terminal and the contact cap.
Claim 3
Dependent Claim
48 words
The galvanic element of claim 1 wherein the element is in the form of a button cell, the contact cap extends over the cell cover, the first seal, and the major portion of the cell cup, and the additional seal is positioned between cell cup and contact cap.
Claim 4
Dependent Claim
19 words
The element of claim 2 wherein the additional seal extends substantially over the entire height of the cell cup.
Claim 5
Dependent Claim
40 words
The galvanic element of claim 1 wherein the second seal is made of a material selected from the group of bitumen, single- or multi-component casting resin, glue, thermoplastic resin, silicone rubber, or a combination of a plurality of said materials.
Claim 6
Dependent Claim
17 words
The galvanic element of claim 1 wherein the second seal is a ceramic ring with surface metallization.
Claim 7
Dependent Claim
38 words
The galvanic element of claim 1 wherein the additional seal is formed in an operation separate from the operation which forms the first seal and the additional seal is adjacent to, but not unitary with the first seal.
Claim 8
Dependent Claim
44 words
The galvanic element of claim 1 wherein the contact cap extends downwardly over the major portion of the cell cup and the second seal fills the space between contact cap and cell cup substantially as far as the lower end of the cell cup.
Claim 9
Dependent Claim
30 words
The galvanic element of claim 1 wherein the additional seal is formed of two discrete portions positioned adjacent to each other in the gap between cell cup and contact cap.
References Cited (Backward Citations)
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US3489616A
Cited
US3615861A
Cited
US3746580A
Cited
US3970477A
Cited
US3990918A
Cited
US4166157A
Cited
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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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |