Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Method of Detecting Contamination on Lithium Batteries

IP.com Disclosure Number: IPCOM000131638D
Publication Date: 2005-Nov-11
Document File: 1 page(s) / 25K

Publishing Venue

The IP.com Prior Art Database

Abstract

To assist in the detection of grease contamination on cell surfaces, grease has been formulated with fluorescent dye. The dye fluoresces under exposure to ultra-violet light and allows small amounts of contamination to be readily seen.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 86% of the total text.

Invention Record

19NOV04

Method of Detecting Contamination on Lithium Batteries

Inventors:                Michael F. Pyszczek, Bradley Bassano

Ref: WGT notebook # R-203, pg. 99, assigned to M. F. Pyszczek

Summary of the Invention:

Contamination on the surface of an implantable lithium battery can produce many problems as the battery is assembled into a device.  If the contaminant is a grease-like substance, adhesion of insulator materials like Kapton, or coatings like Parylene are severely compromised.

Contamination with grease can occur with some frequency during the hermetic inspection of the finished battery.  The test is performed under vacuum in a helium leak test instrument.  The vacuum chamber is sealed using silicone-based high vacuum grease.  Contamination of the cell can occur from the cell contacting the chamber seal, or through transfer by an operator’s glove.  The thin, transparent film can easily escape visual inspection.  To assist in the detection of grease contamination on cell surfaces, grease has been formulated with fluorescent dye.  The dye fluoresces under exposure to ultra-violet light and allows small amounts of contamination to be readily seen.

The preferred method of producing the dyed high vacuum grease is to blend 0.2% by weight of Plyakrome Oil Fluorescent Yellow Dye in Dow Corning High Vacuum Grease.  The method of blending the components may vary according to batch size, but should result in a homogeneous mixture of consistent color. ...