Patent · US Expired

Sealing system for large-surface thin parts

US6338492B1 · kind B1 · utility

30Cited by

24References

14Claims

0Family size

Assignee

Firma Carl Freudenberg · DE

Inventors

Herman Schilling · Weinheim, DE
Eberhard Bock · Prüm, DE
Gunter A. Hofmann · San Diego, US

Key dates

Filing date	Feb 28, 2000
Grant date	Jan 15, 2002
Priority date	—
Expiry date	Feb 28, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02E60/50
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A sealing system for large-surface thin parts to be interconnected, used for the mutual sealing of separating plates, in particular of bipolar plates with interposed ion-exchange membrane units (MEA) in fuel cells. The system uses sealing elements made of polymer material, in which the individual sealing elements, injected into recesses, form an integral unit with the respective associated bipolar plate. Provision is made between the side walls of the sealing elements and the adjacent walls of the recesses for free spaces or gaps to accommodate the elastic sealing material which spreads during the compression. The sealing elements only partially fill the recesses or gaps and the height (H) of the sealing elements are greater than the depth (T) of the recess or gaps before the compression.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.