Gm Global Technolgoy Operations, Inc.

Dennis Wayne Hercamp

Tony E Key

Neil R Eisenhut

A microporous polymer battery separator having a puncture-proof corrugated border along the lateral edges thereof.

Battery separator having a puncture-proof border

Filling a mat-immobilized-electrolyte battery with electrolyte. The battery's container includes a cover having two openings therein. The battery is laid on its side and electrolyte introduced thereinto through the lowermost opening. The electrolyte enters the battery at substantially the wicking rate of the electrolyte into the mat and displaces gases therefrom through the upper opening. Preferably, the battery will lay on its side in a tank of electrolyte whose level is just below the upper openings.

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Pendleton, IN, United States of America

Dennis Wayne Hercamp