Method for controlling battery pack
First Claim
1. A method for controlling a charge current of a battery pack comprising a rechargeable battery, a control circuit that controls a charge operation of the rechargeable battery, and a charge control element controlled by the control circuit so as to control the charge current, the method comprising:
- controlling the charge control element with the control circuit so that the charge control element is turned ON in the charge operation;
detecting the charge current of the rechargeable battery in the charge operation and measuring a detection time using the control circuit;
controlling the charge control element with the control circuit so that the charge control element turns OFF, if the control circuit determines that an abnormality occurs based on the charge current and the detection time; and
while the charge control element is OFF, stopping a charge current supply, when the control circuit determines that a non-charge abnormality has occurred, wherein(i) the control circuit determines that the non-charge abnormality has occurred when the charge current detected is greater than or equal to a first predetermined current value for a first predetermined time period, and(ii) the control circuit determines that the non-charge abnormality has occurred when the charge current detected is less than the first predetermined current value and not less than a second predetermined current value for a second predetermined time period longer than the first predetermined time period.
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Accused Products
Abstract
A method controls a battery pack that includes a rechargeable battery, a control circuit that controls charge operation of the battery, and a charge control element that controls the charge current through the control circuit. In the method, even though the control circuit controls the charge control element so that the charge control element turns to OFF, in a case where the charge current is detected, the control circuit determines that abnormality occurs if detecting that the current flows at a rate not less than a first current value during a first detection period, and additionally determines that abnormality occurs if detecting a state the current flows at a rate less than the first current value for a second detection period longer than the first detection period.
26 Citations
13 Claims
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1. A method for controlling a charge current of a battery pack comprising a rechargeable battery, a control circuit that controls a charge operation of the rechargeable battery, and a charge control element controlled by the control circuit so as to control the charge current, the method comprising:
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controlling the charge control element with the control circuit so that the charge control element is turned ON in the charge operation; detecting the charge current of the rechargeable battery in the charge operation and measuring a detection time using the control circuit; controlling the charge control element with the control circuit so that the charge control element turns OFF, if the control circuit determines that an abnormality occurs based on the charge current and the detection time; and while the charge control element is OFF, stopping a charge current supply, when the control circuit determines that a non-charge abnormality has occurred, wherein (i) the control circuit determines that the non-charge abnormality has occurred when the charge current detected is greater than or equal to a first predetermined current value for a first predetermined time period, and (ii) the control circuit determines that the non-charge abnormality has occurred when the charge current detected is less than the first predetermined current value and not less than a second predetermined current value for a second predetermined time period longer than the first predetermined time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification