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Rechargeable-battery-protection-circuit

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Rechargeable battery protection circuit

Details

Inventors: Tamai, Mikitaka;
Assignee: Sanyo Electric Co., Ltd. (Osaka, JP)
Primary Examiner: Tso; Edward
Assistant Examiner:
Attorney, Agent or Firm: Wenderoth, Lind & Ponack, L.L.P.

The rechargeable battery protection circuit of this invention is provided with a switching system connected in series with the rechargeable battery, a current detection system to measure charging current flowing through the rechargeable battery, and a control system to control the switching system on and off depending on measurement results from the current detection system. The control system puts the switching system in the off state when charging current greater than a specified value flows through the rechargeable battery. This prevents rechargeable battery charging with excessive current.

DETAILED DESCRIPTION The rechargeable battery protection circuit of the present invention is provided with a switching system connected in series with the rechargeable battery, a current detection system to measure charging current flowing through the rechargeable battery, and a control system to control the switching system on and off depending on measurement results from the current detection system.
The control system puts the switching system in the off state when charging current greater than a specified value flows through the rechargeable battery.
Preferably, the control system puts the switching system in the off state when charging current greater than the specified value flows through the rechargeable battery for a time longer than a first specified time interval.
Further, the control system resets the switching system to the on state when a second prescribed time interval has elapsed after the switching system is put in the off state.
Since the rechargeable battery protection circuit of the present invention puts the switching system in the off state to suspend charging when charging current greater than the specified value flows in a battery being charged, excessively large charging current is prevented from flowing in the rechargeable battery and battery degradation due to charging is suppressed.

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