Overvoltage protection circuit for a battery pack

Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging

Patent

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Details

320136, H01M 1046

Patent

active

060086270

ABSTRACT:
A battery pack and an electric/electronic apparatus capable of reliably preventing an overvoltage from being applied to the battery pack without burning a fuse in the electric/electronic apparatus off. The battery pack comprises a battery cell such as a Lithium ion secondary battery, a charge current preventing FET1, a discharge current preventing FET2, a discharge current detecting resistor R2, and a FET control circuit for controlling the FET1 and the FET2, and is characterized in that the FET control circuit detects the value of the current flowing through the battery cell based upon the voltage across the resistor R2, and turns the discharge current preventing FET2 and the charge current preventing FET1 off when the discharge current I.sub.discharge increases to a value which is equal to or larger than the predetermined voltage I.sub.th.

REFERENCES:
patent: 5581170 (1996-12-01), Mammano et al.

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