EP0141568A1
Expired / Lapsed
EP
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Sealed lead-acid battery
Assignee: Yuasa Corp
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Filing: 1984-10-15
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Granted: —
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Expires: 2004-10-15
Abstract
Abstract The Invention envolves a sealed lead-acid battery comprising a cell element having positive plates, negative plates and separators, and electrolyte retained within micropore of the cell element. The micropores of both the plates is substantially filled with the electrolyte, while the micropores of the separators are not completely filled with the electrolyte. The voids formed partialy in the micropores of the separators permit transport of the oxygen gas from the positive plates to the negative plates. Such a sealed lead-acid battery has long service life, and excels in ability to O2 absorb gases and reproduce water during overcharging and to recover by charging after a long overdischarged-state storage.
Inventors
- 👤 Kazuo Okada
- 👤 Yuji Matsumaru
- 👤 Joji Yamashita
- 👤 Kenjiro Kishimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 02:56
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/34; H01M10/342; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
103 words
1) A sealed lead-acid battery comprising a cell element having positive plates, negative plates and separators, and electrolyte retained within micropores of said cell element, said separators having a lower electrolyte absorption and retention power than said positive plates and said negative plates thereby enabling said micropores of both said positive plates and said negative plates to be substantially filled with said electrolyte and thereby causing said micropores of the separators not to be completely filled with said electrolyte but allowing voids formed partialy therein to permit transport of the oxygen gas from said positive plates to said negative plates through said separators.
Claim 2
Dependent Claim
103 words
1) A sealed lead-acid battery comprising a cell element having positive plates, negative plates and separators, and electrolyte retained within micropores of said cell element, said separators having a lower electrolyte absorption and retention power than said positive plates and said negative plates thereby enabling said micropores of both said positive plates and said negative plates to be substantially filled with said electrolyte and thereby causing said micropores of the separators not to be completely filled with said electrolyte but allowing voids formed partialy therein to permit transport of the oxygen gas from said positive plates to said negative plates through said separators.
Claim 3
Dependent Claim
53 words
2) A sealed lead-acid battery according to claim 1, wherein relative contents of said electrolyte in said plates and said separators are such that the sum of the amount of said electrolyte contained in said positive plates and said negative plates is larger than the amount of said electrolyte contained in said separators.
Claim 4
Dependent Claim
39 words
3) A sealed lead-acid battery according to Claim 2, wherein said positive plates have a thickness of 3 to 4 mm and distances between said positive plates and said negative plates have a thickness of 0.7 to 1 mm.
Claim 5
Dependent Claim
30 words
4) A sealed lead-acid battery according to Claim 2, wherein distances between said positive plates and said negative plates have a thickness 0.4 to 0.25 times as said positive plates.
Claim 6
Dependent Claim
47 words
5) A sealed lead-acid battery according to Claim 1 or Claim 2, wherein said separators are formed preponderantly of glass fibers and the specific surface area per unit volume of said separators is smaller than both that of positive active material and that of negative active material.
Claim 7
Dependent Claim
37 words
6) A sealed lead-acid battery according to Claim 5, wherein the total surface area of separators within the unit cell is smaller than both that of said positive active material and that of said negative active material.
Claim 8
Dependent Claim
38 words
7) A sealed lead-acid battery according to Claim 1 or Claim 2 or Claim 5, wherein the amount of said positive active material per unit cell is 1.21 times or more than that of said negative active material.
Claim 9
Dependent Claim
40 words
8) A sealed lead-acid battery according to Claim 1 or Claim 2 or Claim 5, wherein the theoretical capacity of the unit cell for said negative active material is 0.954 times or less than that for said positive active material.
Claim 10
Dependent Claim
46 words
9) A sealed lead-acid battery according to Claim 2 or Claim 5 or Claim 7 or Claim 8, wherein the discharge current density based on one side surface of a positive plate at the 10C discharge is in the range of 0.5 to 0.9 A cm
Claim 11
Dependent Claim
47 words
10) A sealed lead-acid battery according to Claim 2, Claim 5, Claim 7 or Claim 8, wherein said electrolyte contains a compound of at least one alkali metal selected from the group consisting of K, Na, and Li in a concentration of 0.1 to 0.5% by weight.
References Cited (Backward Citations)
US3862861A
Cited
US3862861B1
Cited
DE2149660A1
Cited
FR2290048A1
Cited
GB2084790A
Cited
EP0055888A2
Cited
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