Importance

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Abstract

A method for predicting the loading capability of an accumulator by measuring the current I, voltage U and temperature T of the accumulator, and comparing the measured values with the corresponding values of the response of an equivalent circuit diagram of the accumulator, the parameters of the components of the equivalent circuit diagram and the state variables are varied so that a match with the measured values is obtain. The loading capability is deduced from the matched parameters and state variables determined in this way. The equivalent circuit diagram has the form -Uo-R-CS- and the input voltage U′ of the equivalent circuit diagram is a voltage that is corrected with respect to the measured battery voltage U, the correction function containing as variables only the current I, the voltage U and the temperature T and as a nonlinear term a logarithmic dependency on I. By using the equivalent circuit diagram, the instantaneous loading capability, i.e., the response of the battery under a hypothetical load with an assumed current value I, is predicted by imposing this current value I on the equivalent circuit diagram with the found parameters and evaluating the voltage response calculated.

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