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US 4,904,550 AGranted
Sealed lead-acid battery
AssigneeJapan Storage Battery Co., Ltd.
InventorsSeizo Kano, Naoki Fujimoto
Life of this patent
Estimating the term…
Abstract
A sealed lead-acid battery is improved in manufacturability by providing a container with a major side left open, and being sealed by a laminated sheet heat-bonded to side edges of the opening after the battery components have been inserted. The laminated sheet may include a metal layer to improve rigidity.
Claims7
A sealed lead-acid battery, comprising:
- an assembled battery element comprised of a positive plate, a negative plate and a separator;
- a container molded from a thermoplastic synthetic resin and open on one major side, for accommodating said assembled element;
- and means for sealing said container by closing its open side comprising a heat-bondable sealing sheet, wherein said sealing sheet is a laminated metal sheet having at least two synthetic resin films being bonded to an inner surface of a sheet of metal, with the innermost film of said laminated sheet being heat bondable to the container.
A sealed lead-acid battery comprising:
- an assembled battery element comprised of a positive plate, a negative plate and a separator;
- a container molded from a thermoplastic synthetic resin and open on one major side, for accommodating said assembled element;
- and means for sealing said container by closing its open side comprising a heat-bondable sealing sheet, wherein said sealing sheet is a laminated film of at least two synthetic resin layers which exhibits a moisture permeability of no more than 10 g/m.sup.2 .multidot.day and an oxygen gas permeability of no more than 20 cc/m.sup.2 .multidot.day-atm, with one one side of said film being heat-bondable to the container.
Dependencies are inferred from the claim text.