RESIDUAL CAPACITY DETECTING METHOD FOR ELECTRIC AUTOMOBILE BATTERY

Japanese Patent JP3242774

B2

PURPOSE: To detect the residual capacity of a battery under charge with high accuracy by finding an actual charge amount from an accumulated charged amount obtained by accumulating an average charge current for every preset time and a charge efficiency.
CONSTITUTION: A current detector 16 detects a discharge current ID and a charge current Ic supplied from a charger 14. A voltage detector 18 detects voltage (battery voltage) E between the terminals of a battery 12 and a temperature detector 20 detects the temperature T of the battery 12. In accordance with the detection data output from the detectors 16, 18 and 20, an electronic control unit(ECU) Q2 computes the residual capacity of the battery 12. In a charge mode, a charge efficiency M is computed from the voltage E, and the charge efficiency M is multiplied by an accumulated charge amount Cc to set a charge amount enough for a rated capacity CF. In addition, a target charge amount is corrected by the battery temperature T so as to prohibit overcharge and short charge resulting from the change in the battery temperature T.

JP2007322438	ELECTRONIC EQUIPMENT
JP6747333	Rechargeable battery system
WO/2009/084686	PORTABLE ELECTRONIC DEVICE AND METHOD FOR CONTROLLING THE SAME

Morio Kayano
Kazunori Watanabe

JP33337893A

December 25, 2001

December 27, 1993

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Honda motor industry stock company

G01R31/36; H02J7/00; (IPC1-7): G01R31/36; H02J7/00

JP6327776A
JP2273037A
JP62276476A
JP5137211A

Takehiro Chiba (1 outside)

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