Battery capacity calculating method, battery capacity...

Details Battery capacity calculating method, battery capacity... Battery capacity calculating method, battery capacity...

2006-07-18

2006-07-18

Berhane, Adolf Deneke (Department: 2838)

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

C320S132000, C324S427000

Reexamination Certificate

active

07078907

ABSTRACT:
A battery calculating method, apparatus, and program are provided. The battery capacity calculating method and apparatus can very accurately calculate a residual capacity of a secondary battery especially in the last stage of discharging independently of environmental conditions such as a temperature or a deteriorated state. the battery capacity calculating apparatus is equipped with a voltage measuring circuit which measures the terminal voltage (Vmea) of a battery at the time of discharging, a current measuring circuit which measures the current value (I) of the battery at the time of discharging, and a control circuit which calculates a residual capacity and/or residual power. The operation unit in the control circuit calculates a discharged capacity (Qmea) and an apparent discharged capacity (Qocv) based on a terminal voltage (Vmea) and a current value (I) measured by the voltage measuring circuit and the current measuring circuit, respectively, estimates a discharge curve (Cpre) in the future including the last stage of discharging based on a capacity shift (ΔQ) being the difference between the discharged capacity (Qmea) and the apparent discharged capacity (Qocv) during discharging, and calculates the residual capacity and/or the residual power of the battery based on the estimated discharge curve (Cpre).

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