Device and method for determining state of charge
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHidenori Yokoyama
Life of this patent
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Abstract
A device for determining a state of charge of a battery with high precision regardless of deterioration of the battery. After fully charging the battery, the device sets the battery to an arbitrary state of charge. The device then detects the charging voltage and the charging current occurring at that time. Based on the detected charging voltage and the detected charging current, the device corrects a pre-stored relationship among the charging voltage, the charging current, and the state of charge. After that, based on the corrected relationship, the device determines a state of charge of the battery.
Claims12
A device for determining a state of charge of a battery comprising:
- a memory device that stores a relationship among a charging voltage, a charging current, and the state of charge;
- a controller that controls the state of charge;
- a detector that detects a charging voltage and a charging current at a predetermined state of charge obtained by discharging the battery from a fully charged state;
- and
- a changing device that changes the relationship stored in the memory device based on the detected charging voltage and the detected charging current.
A device for determining a state of charge of a battery comprising:
- means for storing a relationship among a charging voltage, a charging current, and the state of charge;
- means for controlling the state of charge;
- means for detecting a charging voltage and a charging current at a predetermined state of charge obtained by discharging the battery from a fully charged state;
- and
- means for changing the relationship stored in the means for storing a relationship among a charging voltage, a charging current, and the state of charge, based on the detected charging voltage and the detected charging current.
A method for determining a state of charge of a battery comprising:
- storing a relationship among a charging voltage, a charging current, and the state of charge;
- charging a battery to a fully charged state;
- discharging the battery to a predetermined state of charge from the fully charged state;
- detecting at least one charging voltage and one charging current at the predetermined state;
- and
- changing the relationship based on the detected charging voltage and the detected charging current.
Dependencies are inferred from the claim text.