Unitary separator and electrode structure and method of manufacturing separator
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United States of America Patent
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Mar 28, 2000
Grant Date -
N/A
app pub date -
Dec 12, 1997
filing date -
Dec 12, 1997
priority date (Note) -
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Abstract
A secondary battery separator comprises a fibrous core embedded in a polymeric sheet having improved electrode fusion thereto in unitary construction. In the process of manufacturing the separator, a fibrous, polymeric, substantially two-sided core matrix is coated with a polymer mixture containing a plasticizer and a solvent vehicle, and a vacuum is applied to the reverse side from the coated side to cause the polymer mixture to penetrate and infuse the capillary voids of the core matrix from the opposite coated side. The vacuum is continued until the solvent vehicle is fully volatilized. After the solvent vehicle has dissipated, the fiber matrix is turned over, and the process is repeated by applying a coating of polymer mixture to the second side and pulling a vacuum on the opposite side to cause penetration of the matrix.
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