US4391036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing sealed lead-acid battery
Assignee: Yuasa Corp
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Filing: 1981-07-31
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Granted: 1983-07-05
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Expires: 2001-07-31
Abstract
Abstract A plate group is formed of positive and negative plates and separators formed mostly of glass fibers of a diameter not thicker than 1.0 micron and is inserted into a container. Then, a sulfuric acid electrolyte of a concentration of a viscosity increasing agent of 0 to 3.0% by weight is first poured in an amount smaller than the total pore volume of the plate group and a sulfuric acid electrolyte of a concentration of the viscosity increasing agent higher than in the above poured sulfuric acid electrolyte is then poured in so that the total poured amount may be the same as or larger than the total pore volume of the plate group. The sealed lead-acid battery obtained as mentioned above has an excellent discharge characteristic and gas recombining performance, is low in the internal resistance, is long in the service life and does not leak the electrolyte.
Inventors
- 👤 Kenjiro Kishimoto
- 👤 Hideaki Igarashi
- 👤 Migaki Kono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:24
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/34; H01M10/342; H01M50/00; H01M50/40; H01M50/409; H01M50/431; H01M50/434; H01M50/437; H01M50/44; H01M2300/00; H01M2300/0002; H01M2300/0005; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/4911; Y10T29/49115
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
A process for producing a sealed lead-acid battery comprising the steps of positioning a plate group in a container, the plate group being formed of positive and negative plates with separators therebetween, the separators being formed mostly of glass fibers having diameters of not more than 1.0 micron, arranging a viscosity-increasing agent in the peripheral part of the plate group, pouring a first sulfuric acid electrolyte into the container in an amount which is less than the total pore volume of the plate group, pouring a second sulfuric acid electrolyte into the container in an amount such that the total amount of poured electrolyte is at least equal to the total pore volume of the plate group, and sealing the container to form the sealed lead-acid battery.
Claim 2
Dependent Claim
127 words
A process for producing a sealed lead-acid battery comprising the steps of positioning a plate group in a container, the plate group being formed of positive and negative plates with separators therebetween, the separators being formed mostly of glass fibers having diameters of not more than 1.0 micron, arranging a viscosity-increasing agent in the peripheral part of the plate group, pouring a first sulfuric acid electrolyte into the container in an amount which is less than the total pore volume of the plate group, pouring a second sulfuric acid electrolyte into the container in an amount such that the total amount of poured electrolyte is at least equal to the total pore volume of the plate group, and sealing the container to form the sealed lead-acid battery.
Claim 3
Dependent Claim
36 words
A process for producing a sealed lead-acid battery according to claim 1 wherein said viscosity-increasing agent is at least one member selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide and magnesium oxide.
Claim 4
Dependent Claim
29 words
A process for producing a sealed lead-acid battery according to claim 2 wherein the specific surface area of said viscosity increasing agent is larger than 200 m 2 /g.
Claim 5
Dependent Claim
24 words
A process for producing a sealed lead-acid battery according to claim 1 wherein said separators include glass fibers having diameters greater than 1.0 micron.
Claim 6
Dependent Claim
34 words
A process for producing a sealed lead-acid battery according to claim 4 wherein the glass fibers which have diameters greater than 1.0 micron include glass fibers which have diameters of 10 to 20 microns.
Claim 7
Dependent Claim
22 words
A process for producing a sealed lead-acid battery according to claim 4 wherein the glass fibers in said separators are entangled together.
Claim 8
Dependent Claim
54 words
A process for producing a sealed lead-acid battery according to claim 1 wherein the positive and negative plates in said plate group are generally rectangular in shape, the height of said positive and negative plates is larger than 60 mm and the ratio of their height to their width is not less than 1.0.
Claim 9
Dependent Claim
31 words
A process for producing a sealed lead-acid battery according to claim 1 wherein the average concentration of said viscosity-increasing agent in the formed lead-acid battery is 0.01 to 4.0% by weight.
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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |