Rechargeable battery pack with pre-end signal output terminal and electronic device containing rechargeable battery pack
First Claim
1. A rechargeable battery pack comprising:
- a rechargeable secondary battery connectable in use to an external device;
an overcharging/overdischarging-and-overcurrent control circuit connected to the secondary battery for detecting at least one of a voltage across the secondary battery and a current through the secondary battery and for outputting an indicating signal when the secondary battery is in one of a first state in which the secondary battery is approaching one of an overcharged state, an overdischaraed state and an overcurrent state and a second state in which the secondary battery is in one of an overcharged state, an overdischarged state and an overcurrent state;
a switch circuit connected to the overcharging/overdischarging-and-overcurrent control circuit for selectively disconnecting the rechargeable secondary battery from the external device based on the indicating signal of the overcharging/overdischarging-and-overcurrent control circuit; and
means for outputting a pre-end signal shortly before the switch circuit disconnects the rechargeable secondary battery from the external device to thereby enable a task to be performed before the secondary battery is disconnected from the external device.
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Accused Products
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.
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Citations
17 Claims
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1. A rechargeable battery pack comprising:
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a rechargeable secondary battery connectable in use to an external device; an overcharging/overdischarging-and-overcurrent control circuit connected to the secondary battery for detecting at least one of a voltage across the secondary battery and a current through the secondary battery and for outputting an indicating signal when the secondary battery is in one of a first state in which the secondary battery is approaching one of an overcharged state, an overdischaraed state and an overcurrent state and a second state in which the secondary battery is in one of an overcharged state, an overdischarged state and an overcurrent state; a switch circuit connected to the overcharging/overdischarging-and-overcurrent control circuit for selectively disconnecting the rechargeable secondary battery from the external device based on the indicating signal of the overcharging/overdischarging-and-overcurrent control circuit; and means for outputting a pre-end signal shortly before the switch circuit disconnects the rechargeable secondary battery from the external device to thereby enable a task to be performed before the secondary battery is disconnected from the external device. - View Dependent Claims (2)
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3. A rechargeable battery pack comprising:
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a rechargeable secondary battery connectable in use to an external device; an overcharging/overdischarging-and-overcurrent control circuit connected to the secondary battery for detecting at least one of a voltage across the secondary battery and a current through the secondary battery and for outputting an indicating signal when the secondary battery is in one of a first state when the detected voltage is approaching one of a predetermined overcharge voltage and a predetermined overdischarge voltage and a second state when the detected current approaches a predetermined overcurrent value; a delay circuit for delaying the indicating signal and outputting a delayed indicating signal; a switch circuit for selectively connecting and disconnecting the secondary battery to and from the external device in response to the delayed indicating signal; and means for outputting a pre-end signal shortly before the switch circuit disconnects the secondary battery from the external device to thereby enable a task to be performed before the secondary battery is disconnected from the external device. - View Dependent Claims (4)
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5. In a rechargeable battery pack which is connectable in use to an external device and which has means for detecting the states of overcharging, overdischarging and overcurrent of a secondary battery to control charging and discharging thereof:
- a detecting circuit for detecting at least one of a voltage across the secondary battery and a current through the secondary battery; and
means for producing a pre-end signal shortly before the secondary battery becomes in one of an overcharged, an overdischarged and an overcurrent state to thereby enable a task to be performed before the secondary battery is disconnected from the external device. - View Dependent Claims (6, 7, 8, 9, 10)
- a detecting circuit for detecting at least one of a voltage across the secondary battery and a current through the secondary battery; and
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11. An electronic device having a rechargeable battery pack, the rechargeable battery pack comprising:
- a control circuit for detecting at least one of a voltage across and a current through a battery, determining whether the battery is in one of an overcharged, an overdischarged and an overcurrent state, and outputting an indicating signal when the battery is in one of an overcharged, an overdischarged and an overcurrent state; and
means for producing a pre-end signal before the indicating signal is produced to enable a task to be performed before the battery enters an overcharged, overdischarged or overcurrent state. - View Dependent Claims (12, 13)
- a control circuit for detecting at least one of a voltage across and a current through a battery, determining whether the battery is in one of an overcharged, an overdischarged and an overcurrent state, and outputting an indicating signal when the battery is in one of an overcharged, an overdischarged and an overcurrent state; and
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14. A rechargeable battery pack comprising:
- external connection terminals connectable to a rechargeable battery and an external device;
an overcharging/overdischarging-and-overcurrent control circuit connected to the rechargeable battery when in use for detecting a voltage across the secondary battery and a current through the rechargeable battery;
a switch circuit connected to the rechargeable battery and the external device when in use for disconnecting the rechargeable battery from the external device when the rechargeable battery is in one of an overcharged state, an overdischarged state and an overcurrent state; and
means for outputting a pre-end signal shortly before the rechargeable battery becomes in one of an overcharged, an overdischarged and an overcurrent state to thereby enable a task to be performed before the rechargeable battery is disconnected from the external device. - View Dependent Claims (15, 16, 17)
- external connection terminals connectable to a rechargeable battery and an external device;
Specification