PRESSURE-RELIEF MECHANISM TO IMPROVE SAFETY IN LITHIUM-POLYMER BATTERY CELLS
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United States of America Patent
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app pub date -
Dec 16, 2013
filing date -
Nov 20, 2009
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Abandoned
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Abstract
The disclosed embodiments relate to a battery cell which includes a weakness for relieving pressure. This battery cell includes a jelly roll comprising layers which are wound together, including a cathode with an active coating, a separator and an anode with an active coating. The jelly roll also includes a first conductive tab coupled to the cathode and a second conductive tab coupled to the anode. The jelly roll is enclosed in a flexible pouch, wherein the first and second conductive tabs extend through seals in the pouch to provide terminals for the battery cell. This pouch includes a weakness which yields when internal pressure in the pouch exceeds a threshold to create a hole which releases the internal pressure.
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