Non-Aqueous Electrolyte Secondary Battery
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United States of America Patent
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Issued Date -
Dec 5, 2013
app pub date -
Feb 16, 2012
filing date -
Feb 18, 2011
priority date (Note) -
Abandoned
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Abstract
In non-aqueous electrolyte secondary batteries, an organic solvent is used for an electrolyte. Thus, the non-aqueous electrolyte may be decomposed to produce a gas in the battery to abruptly raise the internal pressure of the battery in an abnormal state such as an internal short circuit or overcharge. In order to prevent a rupture of the battery case due to a rise in internal pressure, the non-aqueous electrolyte secondary battery includes a cleavage valve that opens when the internal pressure rises. The cleavage valve includes a valve element and a ring member, and is installed in a through hole provided in a lid plate. In order to prevent corrosion of the cleavage valve, a corrosion preventing foil is provided to cover the through hole provided in the lid plate of the battery case from inside the battery case to cover the cleavage valve.
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