Stanley B Lewin

US Patent:

53168747, May 31, 1994

Filed:

Dec 30, 1992

Appl. No.:

7/998538

Inventors:

Joseph N. Barrella - Irvington NY
Stanley Lewin - New Rochelle NY

Assignee:

Ultralife Batteries, Inc. - Newark NY

International Classification:

H01M 226

US Classification:

429161

Abstract:

Internal intercell and terminal cell electrical connector elements in an electrochemical battery are protected from corrosion and build-up of high internal resistance by coating the electrical connector elements with a layer of a protective preferably non-conductive viscous material such as silicone, prior to pressure contacting or welding of the electrical connector elements. The silicone is removed only at the point of contact between the connector elements while retaining a surrounding protective barrier against the corrosive effects of the cell components and particularly corrosive fluid organic electrolyte materials in high energy density cells.

US Patent:

59283912, Jul 27, 1999

Filed:

May 27, 1997

Appl. No.:

8/863407

Inventors:

Stanley Lewin - New Rochelle NY

Assignee:

Ultralife Batteries, Inc. - NY

International Classification:

H01M 1038
H01M 1040

US Classification:

296235

Abstract:

A method for production of porous electrodes and separators in polymer type electrochemical cells and batteries wherein electrodes and separator elements are mixed with polymeric filler materials such as dibutyl phthalate (DBP). The polymeric filler material is then removed to provide the requisite porosity for the electrodes and separator. The polymeric filler material, normally removed by use of volatile solvents, is instead removed by extraction with supercritical fluids, such as CO. sub. 2, which do not result in any hazardous residue or gases.

US Patent:

59167041, Jun 29, 1999

Filed:

Oct 10, 1997

Appl. No.:

8/948513

Inventors:

Stanley Lewin - New Rochelle NY
Mark Cholach - Webster NY

Assignee:

Ultralife Batteries - Newark NY

International Classification:

H01M 208
H01M 212

US Classification:

429 54

Abstract:

A low pressure vented battery structure comprised of lithium ion polymer cells contained within a flexible container. The flexible container is punctured to provide a venting aperture. The venting aperture is externally sealingly covered with a vent structure comprising a first chemically inert plastic film layer having a central aperture which is adhered to the flexible container around the periphery of the central aperture, with the central aperture being in registration with the venting aperture. A second film chemically inert layer membrane is partially adhered to the first layer, whereby the membrane is stretched and anchored in a position covering the central aperture and the venting aperture, and partially separated from the first layer to provide a venting pathway from the venting aperture to the ambient atmosphere. The second film layer is releasably sealed to the first layer, at the position of partial separation, by a releasable sealing material of sufficient strength to maintain a seal under equalized internal and external pressure conditions and normal handling of the cell or battery. The sealing material is released from maintaining sealed engagement between the first and second film layers seal with the second film layer separating from the first under a predetermined low pressure value whereby the excess low pressure is atmospherically vented between the first and second film layers.