Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Reexamination Certificate
2007-07-17
2010-12-28
Tso, Edward (Department: 2858)
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
C320S150000, C324S427000
Reexamination Certificate
active
07859226
ABSTRACT:
A method and device for safety protection of a secondary battery capable of preventing smoking and ignition thereof. A lithium cell1as a chargeable and dischargeable secondary battery, a protection circuit11for shutting down charging power Pc at the time of overcurrent, overvoltage, etc., and an electric power restriction circuit20for limiting the charging power Pc input to the lithium cell1are incorporated into a battery pack10. A battery charger12, equipped with a stabilized electric source13and a charging circuit14, inputting the charging power Pc to the lithium cell1, is connected to a previous stage of the battery pack10. The electric power restriction circuit20limits the charging power Pc within a boundary value Pmax of a safety operation region for safely using the lithium cell1, thereby permitting the lithium cell1to operate safely under any conditions.
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Kato Masayuki
Nagasawa Yasuo
Nakazawa Hiroshi
McDermott Will & Emery LLP
TDK-Lambda Corporation
Tso Edward
Williams Arun
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