DIAGNOSTIC DEVICE FOR DEGRADATION OF RECHARGEABLE LI-ION BATTERY
First Claim
1. A diagnostic device for degradation of rechargeable battery comprising:
- means for breaking charge current of the rechargeable battery connected to charge circuit at charging or discharge current of the rechargeable battery connected to discharge circuit at discharging;
a voltage measurement part which measures terminal voltage of the rechargeable battery in which charge current or discharge current is broken by the breaking means; and
means for diagnosing degradation of the rechargeable battery based on the temporal change of terminal voltage measured by the voltage measurement part.
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Accused Products
Abstract
A diagnostic device which can measure quickly and has simple circuit is provided. A charge/discharge circuit 2 supplies charge current to a rechargeable battery 10 and discharges the rechargeable battery 10. The charge/discharge circuit 2 also breaks charge current or discharge current of the rechargeable battery 10 in charging or discharging. A voltage measurement part 6 measures terminal voltage of the rechargeable battery 10 after breaking the charge or discharge current. Diagnostic means 8 judges whether the rechargeable battery 10 is deteriorated or not based on the measured voltages. Voltage change of deteriorated rechargeable battery 10 after breaking the charge or discharge current is more rapid than that of healthy rechargeable battery 10. The diagnostic means 8 can judge whether the rechargeable battery 10 is deteriorated or not based on such voltage change.
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Citations
11 Claims
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1. A diagnostic device for degradation of rechargeable battery comprising:
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means for breaking charge current of the rechargeable battery connected to charge circuit at charging or discharge current of the rechargeable battery connected to discharge circuit at discharging; a voltage measurement part which measures terminal voltage of the rechargeable battery in which charge current or discharge current is broken by the breaking means; and means for diagnosing degradation of the rechargeable battery based on the temporal change of terminal voltage measured by the voltage measurement part. - View Dependent Claims (2, 3, 4, 5)
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6. A charge device for rechargeable battery comprising:
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charge circuit which supplies charge current to the rechargeable battery; means for breaking charge current of the rechargeable battery connected to charge circuit at charging or discharge current of the rechargeable battery connected to discharge circuit at discharging; a voltage measurement part which measures terminal voltage of the rechargeable battery in which charge current or discharge current is broken by the breaking means; and means for diagnosing degradation of the rechargeable battery based on the temporal change of terminal voltage measured by the voltage measurement part. - View Dependent Claims (7, 8, 9, 10)
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11. A diagnostic method for degradation of rechargeable battery, the method comprising the steps:
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breaking charge current of the rechargeable battery connected to charge circuit at charging or discharge current of the rechargeable battery connected to discharge circuit at discharging; measuring terminal voltage of the rechargeable battery in which charge current or discharge current is broken by the breaking means; and diagnosing degradation of the rechargeable battery based on the temporal change of terminal voltage measured by the voltage measurement part.
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Specification