Battery state judging apparatus
First Claim
1. A battery state judging apparatus comprising:
- a current detecting means for detecting a charge/discharge current of a battery;
a charge/discharge electric quantity detecting means for adding a current correction coefficient corresponding to the charge/discharge current detected by said current detecting means to said charge/discharge current to detect a charge/discharge electric quantity;
a battery residual capacity calculating means for calculating a battery residual capacity from a reference capacity value and said charge/discharge electric quantity of said battery;
a consumed power detecting means for detecting a consumed power of said battery;
a charge/discharge current estimating means for estimating a charge/discharge current of said battery from said battery residual capacity and said battery consumed power; and
a correcting means for correcting said battery residual capacity on the basis of a correction quantity corresponding to a difference between said estimated charge/discharge current detected by said charge/discharge current estimating means and said charge/discharge current detected by said current detecting means.
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Accused Products
Abstract
A battery state judging apparatus comprising a voltage detector detecting a voltage at a terminal of a battery, a current detector detecting a charge/discharge current of the battery and an arithmetic operation circuit calculating a residual capacity index of the battery relating to a value obtained by subtracting a quantity of electric charge from a reference capacity value of the battery and calculating a power consumption of the battery from the detected terminal voltage and charge/discharge current. The arithmetic operation circuit estimates a charge/discharge current as a function of the battery residual capacity index and battery power consumption and successively estimates a charge/discharge current in a predetermined power consumption pattern to successively calculate a battery residual capacity index from the estimated charge/discharge current. A battery operable threshold is judged when a battery discharge current, estimated on the basis of an updated battery residual capacity index exceeds a threshold current at that power consumption, and a result is displayed via a display circuit.
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Citations
6 Claims
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1. A battery state judging apparatus comprising:
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a current detecting means for detecting a charge/discharge current of a battery; a charge/discharge electric quantity detecting means for adding a current correction coefficient corresponding to the charge/discharge current detected by said current detecting means to said charge/discharge current to detect a charge/discharge electric quantity; a battery residual capacity calculating means for calculating a battery residual capacity from a reference capacity value and said charge/discharge electric quantity of said battery; a consumed power detecting means for detecting a consumed power of said battery; a charge/discharge current estimating means for estimating a charge/discharge current of said battery from said battery residual capacity and said battery consumed power; and a correcting means for correcting said battery residual capacity on the basis of a correction quantity corresponding to a difference between said estimated charge/discharge current detected by said charge/discharge current estimating means and said charge/discharge current detected by said current detecting means. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification