Method for Li-Ion safety switch fault detection in smart batteries
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United States of America Patent
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-
Jul 31, 2001
Grant Date -
N/A
app pub date -
Feb 26, 1999
filing date -
Feb 26, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for testing safety circuitry in rechargeable battery packs is provided herein by which the operation and integrity of circuits associated with rechargeable cells may be verified. A controller 103 senses current flow during cell 108 charge or discharge. The controller 103 then activates the safety circuitry and once again senses current to ensure high circuit impedance. If a fault is detected, the controller 103 notifies the user or host device. The controller 103 then decides if the fault warrants isolating the cell 108 from the terminals of the battery pack 111, 112. If such action is warranted, the controller 103 clears the current carrying path 104, 105, creating a fail condition that does not endanger the user or associated equipment.
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