Electricity: battery or capacitor charging or discharging – Battery or cell discharging – With charging
Patent
1997-05-30
2000-04-18
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Battery or cell discharging
With charging
H01M 1046
Patent
active
060519568
ABSTRACT:
When overdischarging or overcurrent of a rechargeable battery pack is detected, the output voltage current and output current between VDD and VSS of the pack become zero. In this case, a device, or a load, connected with the battery pack may lose data or malfunction. In a rechargeable battery pack 1, if a voltage V1 across a secondary battery decreases below a certain detection voltage V2, a pre-end signal output circuit 5 produces a pre-end output signal, which is made to persist until an overcharging/overdischarging-and-overcurrent control circuit 3 senses that the secondary battery voltage V1 has decreased below an overdischarging detection voltage V3. The output signal from the control circuit 3 causes the switch circuit 4 to stop discharging of the secondary battery. Therefore, the device, or load, can save data or otherwise operate.
REFERENCES:
patent: 5493197 (1996-02-01), Eguchi et al.
patent: 5554919 (1996-09-01), Uchida
patent: 5644211 (1997-07-01), Tokuyama
patent: 5654622 (1997-08-01), Toya et al.
patent: 5742148 (1998-04-01), Sudo et al.
Seiko Instruments Inc.
Tso Edward H.
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