Patent US4072802A successfully refreshed from Google Patents.
US4072802A
Expired / Lapsed
US
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Storage battery, separator therefor
Assignee: Yuasa Corp
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Filing: 1977-01-27
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Granted: 1978-02-07
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Expires: 1997-01-27
Abstract
Abstract The present invention relates to a high performance lead-acid storage battery having a special microporous separator between a positive and a negative plate in a cell of the battery. The separator is comprised of a microporous embossed thin sheet having many small projecting embossed parts which provides unique characteristics in a cell including low electric internal resistance in the cell, sufficient electrolyte between the plates in the cell and sufficient elasticity of the separator to prevent active material shedding, thereby giving a high performance at a high rate of discharge and long life.
Inventors
- 👤 Kazuo Murata
- 👤 Shiro Tanso
- 👤 Junzo Yamao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:41
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/44; H01M50/449; H01M50/451; H01M50/454; H01M50/463; H01M50/489; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M50/431; H01M50/434; H01M50/437; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
183 words
A lead-acid storage battery comprising a container, at least one set of battery plates, one plate of the set being a positive plate and another being a negative plate, and a separator interposed between the positive and negative plates, the microporous separator comprising a microporous sheet of heat meltable synthetic resin containing film of less than 0.5 mm in thickness and having submicron micropores, said microporous sheet having a plurality of independent limited embossed parts projecting outwardly from the separator toward the positive plate, each of said projecting embossed parts being substantially less than 1 cm 2 in area and the height of the embossed parts being less than 1.5 mm, the number of embossed parts on the sheet being more than 50 per square 100 cm 2 of sheet, the projecting embossed parts being connected substantially with projecting embossed channels which help gas formed in the cell escape upward out of the cell, the height of the projecting embossed channels being lower than the height of said projecting embossed parts, and the pores of said embossed parts being at least partially closed.
Claim 2
Dependent Claim
183 words
A lead-acid storage battery comprising a container, at least one set of battery plates, one plate of the set being a positive plate and another being a negative plate, and a separator interposed between the positive and negative plates, the microporous separator comprising a microporous sheet of heat meltable synthetic resin containing film of less than 0.5 mm in thickness and having submicron micropores, said microporous sheet having a plurality of independent limited embossed parts projecting outwardly from the separator toward the positive plate, each of said projecting embossed parts being substantially less than 1 cm 2 in area and the height of the embossed parts being less than 1.5 mm, the number of embossed parts on the sheet being more than 50 per square 100 cm 2 of sheet, the projecting embossed parts being connected substantially with projecting embossed channels which help gas formed in the cell escape upward out of the cell, the height of the projecting embossed channels being lower than the height of said projecting embossed parts, and the pores of said embossed parts being at least partially closed.
Claim 3
Dependent Claim
42 words
A lead-acid storage battery according to claim 1, wherein the separator includes a macroporous base material at least partially integrated with the microporous sheet, the macroporous base material made of non-woven fabric and having pores of at least ten microns in size.
Claim 4
Dependent Claim
36 words
A lead-acid storage battery according to claim 2, wherein the macroporous base material is formed of a synthetic resin material having a higher softening point temperature than that of the synthetic resin of the microporous sheet.
Claim 5
Dependent Claim
32 words
A lead-acid stoage battery according to claim 1, wherein the shape of the area of an individual embossed projecting part is selected from the group consisting of dot, diamond, rhombic and elliptical.
Claim 6
Dependent Claim
25 words
A lead-acid storage battery according to claim 4, wherein a major axis of the shape of the area of the embossed parts are oriented vertically.
Claim 7
Dependent Claim
16 words
A lead-acid storage battery according to claim 1, wherein the microporous sheet also contains inorganic material.
Claim 8
Dependent Claim
41 words
A lead-acid storage battery according to claim 1, wherein the synthetic resin of the microporous sheet is selected from a group consisting of at least one of polyvinyl chloride, polystyrene, heat-resistant ABS, polysulfone, polyvinylidene fluoride, polypropylene and vinyl chloride-vinylidene chloride copolymer.
Claim 9
Dependent Claim
33 words
A lead-acid storage battery according to claim 1, wherein the surface area of the embossed areas is in a range of 5 to 40% of the overall surface area of the microporous separator.
Claim 10
Dependent Claim
23 words
A lead-acid storage battery according to claim 1, wherein concave parts formed by the embossed projecting parts are filled with a synthetic resin.
Claim 11
Dependent Claim
141 words
A separator adapted to be interposed between a positive and negative plate in a lead-acid storage battery comprising a microporous sheet of heat meltable synthetic resin containing film of less than 0.5 mm in thickness and having submicron micropores, said microporous sheet having a plurality of independent limited embossed parts projecting outwardly from the separator, each of said projecting embossed parts being substantially less than 1 cm 2 in area and the height of the embossed parts being less than 1.5 mm, the number of embossed parts on the sheet being more than 50 per square 100 cm 2 of sheet, the projecting embossed parts being connected substantially with projecting embossed channels, the height of the projecting embossed channels being lower than the height of said projecting embossed parts, and the pores of said embossed parts being at least partially closed.
Claim 12
Dependent Claim
141 words
A separator adapted to be interposed between a positive and negative plate in a lead-acid storage battery comprising a microporous sheet of heat meltable synthetic resin containing film of less than 0.5 mm in thickness and having submicron micropores, said microporous sheet having a plurality of independent limited embossed parts projecting outwardly from the separator, each of said projecting embossed parts being substantially less than 1 cm 2 in area and the height of the embossed parts being less than 1.5 mm, the number of embossed parts on the sheet being more than 50 per square 100 cm 2 of sheet, the projecting embossed parts being connected substantially with projecting embossed channels, the height of the projecting embossed channels being lower than the height of said projecting embossed parts, and the pores of said embossed parts being at least partially closed.
Claim 13
Dependent Claim
26 words
A separator according to claim 10, further including a macroporous base material made of non-woven fabric and having pores of at least ten microns in size.
Claim 14
Dependent Claim
34 words
A separator according to claim 11, wherein the macroporous base material is formed of a synthetic resin material having a higher softening point temperature than that of the synthetic resin of the microporous sheet.
Claim 15
Dependent Claim
30 words
A separator according to claim 10, wherein the shape of the area of an individual embossed projecting part is selected from the group consisting of dot, diamond, rhombic and elliptical.
Claim 16
Dependent Claim
23 words
A separator according to claim 13, wherein a major axis of the shape of the area of the embossed parts are oriented vertically.
Claim 17
Dependent Claim
14 words
A separator according to claim 10, wherein the microporous sheet also contains inorganic material.
Claim 18
Dependent Claim
39 words
A separator according to claim 10, wherein the synthetic resin of the microporous sheet is selected from a group consisting of at least one of polyvinyl chloride, polystyrene, heat-resistant ABS, polysulfone, polyvinylidene fluoride, polypropylene and vinyl chloride-vinylidene chloride copolymer.
Claim 19
Dependent Claim
31 words
A separator according to claim 10, wherein the surface area of the embossed areas is in a range of 5 to 40% of the overall surface area of the microporous separator.
Claim 20
Dependent Claim
21 words
A separator according to claim 10, wherein concave parts formed by the embossed projecting parts are filled with a synthetic resin.
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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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |