Patent US4781996A successfully refreshed from Google Patents.
US4781996A
Expired / Lapsed
US
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Fuel cell
Assignee: New Energy and Industrial Technology Development Organization
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Filing: 1987-06-12
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Granted: 1988-11-01
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Expires: 2007-06-12
Abstract
Abstract The fuel cell of this invention has the following electrolyte plate and separator plate. An electrolyte plate made of ceramics which is interposed between an anode and a cathode which are arranged opposite to each other. A separator plate which is laminated on the back surface of each of the anode and cathode and which is made of such a material and in such a composition that the expansion coefficient thereof is nearly equal to that of the electrolyte plate. According to the above construction, tensile stress applied to the electrolyte plate due to a change in temperature can be reduced and cracking of the electrolyte plate which may occur with lapse of time can be prevented.
Inventors
- 👤 Hajime Toriya
- 👤 Akio Sohma
- 👤 Keizou Ohtsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:30
CPC Classifications
H; H01; H01M; H01M8/00; H01M8/02; H01M8/0289; H01M8/0295; H01M8/0202; H01M8/0204; H01M8/0206; H01M8/14; H01M8/141; H01M8/142; H01M2008/147; H01M2300/00; H01M2300/0017; H01M2300/0048; H01M2300/0051; H01M8/0208; H01M8/021; H01M8/0215; H01M8/0223; H01M8/0228; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A fuel cell comprising a stack of cell units, each of which comprises an anode, a cathode provided opposite to said anode, an electrolyte plate made of ceramic interposed between said anode and said cathode and a separator plate laminated on the back surface of each of said anode and said cathode, said separator plate being made of a material consisting essentially of 25 to 60% by weight of nickel and the balance of iron, wherein an expansion coefficient of the separator plate is substantially equal to that of the electrolyte plate.
Claim 2
Dependent Claim
92 words
A fuel cell comprising a stack of cell units, each of which comprises an anode, a cathode provided opposite to said anode, an electrolyte plate made of ceramic interposed between said anode and said cathode and a separator plate laminated on the back surface of each of said anode and said cathode, said separator plate being made of a material consisting essentially of 25 to 60% by weight of nickel and the balance of iron, wherein an expansion coefficient of the separator plate is substantially equal to that of the electrolyte plate.
Claim 3
Dependent Claim
21 words
A fuel cell according to claim 1 wherein the separator plate comprises 25-60% by weight of Ni and balance of Fe.
Claim 4
Dependent Claim
20 words
A fuel cell according to claim 1, wherein a cathode side of the separator plate has an oxidation resistant surface.
Claim 5
Dependent Claim
20 words
A fuel cell according to claim 1, wherein an anode side of the separator plate has a corrosion resistant surface.
Claim 6
Dependent Claim
94 words
A fuel cell comprising a stack of cell units, each of which comprises an anode, a cathode provided opposite to said anode, a separator plate made of a metal and laminated on the back surface of each of said anode and said cathode and an electrolyte plate interposed between said anode and said cathode, said separator plate being made of a material consisting essentially of 25 to 60% by weight of nickel and the balance of iron, wherein an expansion coefficient of the electrolyte plate is substantially equal to that of said separator plate.
Claim 7
Dependent Claim
94 words
A fuel cell comprising a stack of cell units, each of which comprises an anode, a cathode provided opposite to said anode, a separator plate made of a metal and laminated on the back surface of each of said anode and said cathode and an electrolyte plate interposed between said anode and said cathode, said separator plate being made of a material consisting essentially of 25 to 60% by weight of nickel and the balance of iron, wherein an expansion coefficient of the electrolyte plate is substantially equal to that of said separator plate.
Claim 8
Dependent Claim
111 words
A fuel cell comprising a stack of cell units, each of which comprises an anode, a cathode provided opposite to said anode, an electrolyte plate made of porous ceramic comprising a lithium aluminate powder incorporated with an alumina fiber and interposed between said anode and said cathode under a given pressure and a separator plate laminated on the back surface of each of said anode and said cathode, said separator plate being made of a material consisting essentially of 25 to 60% by weight of nickel and the balance of iron, wherein a difference in the expansion coefficient of the separator plate and the electrolyte plate is within ±4×10 -6 l/°C.
Claim 9
Dependent Claim
111 words
A fuel cell comprising a stack of cell units, each of which comprises an anode, a cathode provided opposite to said anode, an electrolyte plate made of porous ceramic comprising a lithium aluminate powder incorporated with an alumina fiber and interposed between said anode and said cathode under a given pressure and a separator plate laminated on the back surface of each of said anode and said cathode, said separator plate being made of a material consisting essentially of 25 to 60% by weight of nickel and the balance of iron, wherein a difference in the expansion coefficient of the separator plate and the electrolyte plate is within ±4×10 -6 l/°C.
Claim 10
Dependent Claim
28 words
A fuel cell according to claim 1, wherein a difference in the coefficient of thermal expansion between the separator plate and the electrolyte plate within ±4×10 -6 l/°C.
Claim 11
Dependent Claim
17 words
A fuel cell according to claim 1, wherein the ceramic is lithium aluminate reinforced with alumina fibers.
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) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |