Secondary battery protection circuit, battery pack and...

Electricity: battery or capacitor charging or discharging – Battery or cell charging – With thermal condition detection

Reexamination Certificate

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Details

C320S151000, C320S144000, C320S153000, C320S154000

Reexamination Certificate

active

07952330

ABSTRACT:
A protection circuit is provided for protecting a secondary battery from overcharging and excessive discharge current by a simple circuit. The protection circuit is provided with a connection terminal (T3) for connecting the secondary battery (6); a connection terminal (T1) for connecting a charging device for charging the secondary battery (6) and/or a load device driven by a discharge current from the secondary battery (6); a bimetal switch (SW1) that is provided between the connection terminals (T1, T3) and turned off in the case of exceeding a specified temperature set beforehand; a heater (R2) for heating the bimetal switch (SW1); and an integrated circuit (IC1) for turning the bimetal switch (SW1) off by causing the heater (R2) to generate heat if a voltage applied to the connection terminal (T3) by the secondary battery (6) exceeds a preset reference voltage.

REFERENCES:
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Japanese Notice of Reasons for Rejection, w/ English translation thereof, issue in Japanese Patent Application No. JP 2005-159889 dated Feb. 23, 2010.
Japanese Notice of Reasons for Rejection, w/ English translation thereof, issued in Japanese Patent Application No. JP 2005-159889 dated Nov. 24, 2010.
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Japanese Notice of Reasons for Rejection, w/ English translation thereof, Issued in Japanese Patent Application No. JP 2005-122765 dated Feb. 15, 2011.

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