Apparatus for preventing deterioration of lithium secondary batt

Details Apparatus for preventing deterioration of lithium secondary batt Apparatus for preventing deterioration of lithium secondary batt

1998-04-21

1999-12-28

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

320150, H01M 1046

Patent

active

060086262

ABSTRACT:
When a battery with series-connected lithium secondary cells is charged to a high voltage, the capacity of the battery is prevented from being irreversibly deteriorated. If a battery current detected by a current sensor is small and a battery voltage detected by a voltage sensor is of a level (4.0 V) higher than a rated voltage (3.6 V) of each of the lithium secondary cells, then a switch is closed to connect a resistor to the battery thereby to forcibly discharge the battery. The voltage across the battery is now lowered to prevent the battery from being left to stand at a high voltage, and hence the capacity of the battery is prevented from being irreversibly deteriorated.

REFERENCES:
patent: 5539318 (1996-07-01), Sasaki
patent: 5703465 (1997-12-01), Kinoshita et al.

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