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Moisture barrier composite film of silicon nitride and fluorocarbon polymer and its use with an on-cell tester for an electrochemical cell

  • US 5,593,794 A
  • Filed: 01/23/1995
  • Issued: 01/14/1997
  • Est. Priority Date: 01/23/1995
  • Status: Expired due to Term
First Claim
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1. An electrochemical cell having a moisture sensitive cell condition tester and a light transparent moisture barrier for protecting said tester from moisture, wherein said moisture barrier comprises a composite on a polymeric substrate, said composite comprising at least one layer of amorphous silicon nitride and at least one layer of a hydrophobic fluorocarbon polymer, alternately deposited over each other, wherein the thickness of said silicon nitride and fluorocarbon polymer layers ranges between about 250 to 2,500 angstroms and between about 250 angstroms to about 1 micron, respectively, and wherein said moisture barrier is no greater than one and one half mils thick.

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