SECONDARY BATTERY PACK
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United States of America Patent
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N/A
Issued Date -
Dec 4, 2008
app pub date -
May 31, 2007
filing date -
May 31, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A chargeable and dischargeable lithium cell and the filter unit capable of absorbing flammable materials are housed inside a casing. When an overvoltage is impressed from a battery charger to a battery pack and then internal gases inside the lithium cell are discharged out of an explosion-proof valve, the flammable materials included in internal gases are absorbed by the filter unit to change the internal gases into nonflammable gases. The internal gases purified by passing through the filter unit are exhausted from a gas-vent opening to the outside of the casing. By providing the filter unit inside the casing, the flammable materials discharged out of the lithium cell 1 can be prevented from leaking to the outside of the casing.
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