METHOD FOR DETECTING OF BATTERY CONDITION
First Claim
1. A method for detecting a charged state of a battery, comprising the steps of:
- pre-forming a relaxation function F(t) for calculating a variation of an open circuit voltage (OCV) of the battery after an elapsed time of t since the battery stops charging and/or discharging, as a function of a quantity regarding a predetermined state of the battery;
measuring a variation of the OCV from the OCV at a time of a stable state regarding the battery;
optimizing the relaxation function F(t) with making use of the variation of the OCV to be measured;
estimating the quantity of the state thereof by making use of the relaxation function F(t) to be optimized; and
detecting the charged state of the battery with reference to the quantity of the state thereof to be estimated.
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Accused Products
Abstract
PROBLEM TO BE SOLVED: To provide a method for detecting a charged state of a battery, for evaluating a deterioration thereof due to each of reaction processes that individually have rates of reactions as different from therebetween, and for performing a detection of the charged state of the battery.
SOLUTION: The method for detecting the charged state of the battery according to the present invention comprises the steps of: measuring a voltage Vmes of the battery, an electric current Imes thereof and a temperature Tmes thereof, and then inputting such the measured values, as a step S1; judging whether or not an absolute value of the measured electric current as the Imes is smaller than a threshold value of the electric current as an Ithre, as a step S2; estimating an OCV20 hr by making use of an SOCn−1 and an SOHn−1, that are the values after charging and/or discharging at the last time, with reference to a stable OCV estimated formula, as a step S4; calculating a difference between the measured value of the voltage as the Vmes and the OCV20 hr, and then saving such the calculated value, as a step S5; renewing a relaxation function as an Fn(t) with corresponding to an amount of time as t, as processes from a step S6 through a step S19; calculating an SOHn at the step S17 with making use of the Fn(t) to be renewed; and calculating an SOCn at the step S19 with making use thereof.
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Citations
11 Claims
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1. A method for detecting a charged state of a battery, comprising the steps of:
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pre-forming a relaxation function F(t) for calculating a variation of an open circuit voltage (OCV) of the battery after an elapsed time of t since the battery stops charging and/or discharging, as a function of a quantity regarding a predetermined state of the battery; measuring a variation of the OCV from the OCV at a time of a stable state regarding the battery; optimizing the relaxation function F(t) with making use of the variation of the OCV to be measured; estimating the quantity of the state thereof by making use of the relaxation function F(t) to be optimized; and detecting the charged state of the battery with reference to the quantity of the state thereof to be estimated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification