AVAILABLE CHARGING / DISCHARGING CURRENT CALCULATION METHOD AND POWER SUPPLY DEVICE
First Claim
1. An available charging/discharging current calculation method that estimates available maximum current values in charging/discharging operations of batteries based on at least one of battery current, voltage and temperature, the method comprising the steps of:
- calculating a resistance value based on an average current value and an average voltage obtained in a predetermined time period;
dividing the calculated resistance value into a physical resistance component and a chemical resistance component;
correcting the chemical resistance component based on the pulse discharging or charging operation time from the past to the present;
acquiring voltage variation values in the history of the past charging/discharging operations;
correcting the physical resistance component based on a detected battery temperature and a detected battery remaining capacity;
estimating battery open-circuit voltages based on the physical and chemical resistance components, and a current, a voltage and the voltage variation values;
obtaining corrected battery open-circuit voltages corresponding to a plurality of setting currents in order to predict the available maximum current values in a particular time;
acquiring predicted reaching voltages corresponding to the plurality of setting currents based on said corrected physical resistance component, said corrected chemical resistance component and said corrected battery open-circuit voltages; and
creating a battery current-voltage curve based on said setting currents and said predicted reaching voltages to acquire upper and lower limit voltages and upper and lower limit currents at a temperature whereby assigning the upper and lower limit currents to the available maximum current values in charging operation and discharging operation, respectively.
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Accused Products
Abstract
A method includes steps of dividing resistance R into a physical and chemical resistances Ro and Rp, obtaining corrected open-circuit voltages Vo corresponding to setting currents Ia to Ix, acquiring predicted reaching voltages Va to Vx corresponding to the setting currents Ia to Ix, and creating a current-voltage curve. The corrected open-circuit voltages Vo are obtained to predict available maximum currents I—target in a particular time t2. The predicted reaching voltages Va to Vx are acquired based on corrected physical and chemical resistances Ro and Rp, and the corrected open-circuit voltages Vo. The current-voltage curve is creased based on the setting currents Ia to Ix and the predicted reaching voltages Va to Vx to acquire upper and lower limit voltages Vmax and Vmin, and upper and lower limit currents Imax and Imin at a temperature whereby assigning these limit currents to available maximum currents I—target in charging and discharging operations, respectively.
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Citations
15 Claims
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1. An available charging/discharging current calculation method that estimates available maximum current values in charging/discharging operations of batteries based on at least one of battery current, voltage and temperature, the method comprising the steps of:
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calculating a resistance value based on an average current value and an average voltage obtained in a predetermined time period; dividing the calculated resistance value into a physical resistance component and a chemical resistance component; correcting the chemical resistance component based on the pulse discharging or charging operation time from the past to the present; acquiring voltage variation values in the history of the past charging/discharging operations; correcting the physical resistance component based on a detected battery temperature and a detected battery remaining capacity; estimating battery open-circuit voltages based on the physical and chemical resistance components, and a current, a voltage and the voltage variation values; obtaining corrected battery open-circuit voltages corresponding to a plurality of setting currents in order to predict the available maximum current values in a particular time; acquiring predicted reaching voltages corresponding to the plurality of setting currents based on said corrected physical resistance component, said corrected chemical resistance component and said corrected battery open-circuit voltages; and creating a battery current-voltage curve based on said setting currents and said predicted reaching voltages to acquire upper and lower limit voltages and upper and lower limit currents at a temperature whereby assigning the upper and lower limit currents to the available maximum current values in charging operation and discharging operation, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An available charging/discharging current calculation method that estimates available maximum current values in charging/discharging operations of batteries based on at least one of battery current, voltage and temperature, the method comprising the steps of:
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detecting a battery voltage; calculating available charging/discharging current values that bring said detected voltage within a range lower than a setting voltage at which the gradient of a battery current-voltage curve sharply changes; and transmitting said calculated available charging/discharging current values to a connected device. - View Dependent Claims (13)
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14. A power supply device comprising:
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a battery unit including a plurality of rechargeable batteries; a voltage detection portion that detects voltages of the rechargeable batteries included the battery unit; a temperature detection portion that detects temperatures of the rechargeable batteries included the battery unit; a current detection portion that detects currents applied to the rechargeable batteries included the battery unit; a calculating portion that calculates the maximum restriction current values on the rechargeable batteries based on signals provided from said voltage detecting portion, said temperature detecting portion and said current detecting portion; and a communication processing portion that transmits a remaining capacity and the maximum restriction current values calculated by said calculating portion to a connected device, wherein said calculating portion can calculate available charging/discharging current values that bring the voltages detected by said voltage detecting portion within a range lower than a setting voltage at which the gradient of a battery current-voltage curve sharply changes. - View Dependent Claims (15)
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Specification