CID retention device for Li-ion cell
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United States of America Patent
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Mar 25, 2014
Grant Date -
May 24, 2012
app pub date -
Nov 15, 2011
filing date -
Jun 22, 2007
priority date (Note) -
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Abstract
A low pressure current interrupt device (CID) activates at a minimal threshold internal gauge pressure. Preferably, the CID includes a first conductive plate and a second conductive plate in electrical communication with the first conductive plate, the electrical communication between the first and the second conductive plates being interrupted at the minimal threshold internal gauge pressure. The first conductive plate can include a frustum having a first end and a second end, a base extending radially from a perimeter of the first end of the frustum, and an essentially planar cap sealing the second end of the frustum. The first end has a broader diameter than the second end, and the second conductive plate is in electrical contact with the essentially planar cap through a weld.
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