Electrochemical cell having improved pressure vent

Patent · 31 December 1992

OSTI ID:868994

Dean, Kevin ^[1]; Holland, Arthur ^[2]; Fillmore, Donn ^[3]

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1. Pontiac, MI
2. Troy, MI
3. Waterford, MI

The electrochemical cell of the instant invention includes a case having a gas outlet, one or more positive electrodes positioned within the case, one or more negative electrodes positioned within the case electrode separators positioned between the positive and negative electrodes, electrolyte positioned within the case, and a pressure vent for releasing internal pressure occurring in the case to the surrounding atmosphere. The pressure vent is affixed to the case covering the gas outlet, the pressure vent includes a vent housing having a hollow interior area in gaseous communication with the surrounding atmosphere and the interior of the case via the gas outlet, a pressure release piston positioned within the hollow interior area, the pressure release piston sized to surround the gas outlet and having a seal groove configured to encapsulate all but one surface of a seal mounted within the seal groove, leaving the non-encapsulated surface of the seal exposed, and a compression spring positioned to urge the pressure release piston to compress the seal in the seal groove and block the gas outlet in the case.

• Research Organization: Ovonic Battery Company, Inc. (Troy, MI)
• Assignee: Ovonic Battery Company, Inc. (Troy, MI)
• Patent Number(s): US 5258242
• OSTI ID: 868994
• Country of Publication: United States
• Language: English

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affixed
atmosphere
block
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configured
covering
electrochemical
electrochemical cell
electrode
electrode separator
electrode separators
electrodes
electrodes positioned
electrolyte
encapsulate
exposed
gas
gas outlet
gaseous
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housing
improved
instant
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internal
internal pressure
leaving
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negative electrodes
non-encapsulated
occurring
outlet
piston
positioned
positive
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positive electrodes
pressure
release
releasing
seal
seal mounted
separators
sized
spring
surface
surround
surrounding
surrounding atmosphere
urge
via