Method and apparatus for measuring battery capacity using voltage response signal based on pulse current
First Claim
1. A method of measuring battery capacity using a voltage response signal based on a pulse current, comprising the steps of:
- measuring a voltage signal based on a pulse current signal applied to at least one end of a battery as a function of time;
analyzing the measured voltage signal to determine parameters, wherein the parameters are model parameters determined from an approximation of the measured voltage signal to an impedance function obtained from an equivalent circuit comprising resistances and model parameters of a condenser;
examining a correlation between the parameters and the capacity of the battery measured by a real-time discharge method; and
based on the correlation, determining the unknown capacity of the battery from a voltage characteristic in response to the pulse current applied to the battery.
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Abstract
A method of measuring battery capacity using a voltage response signal based on a pulse current, where the method includes the steps of: measuring a voltage response signal based on a pulse current signal applied to a primary or secondary battery; performing an approximation of the measured voltage response signal to an equivalent circuit model composed of resistors, capacitors and transmission lines to determine the model parameters; and determining the unknown battery capacity from the voltage response characteristics based on a correlation between the measured capacity and the model parameters, which correlation is previously determined by a real-time discharge method, thereby takes a shorter time than a real-time discharge method and delivering efficiency and reliability in determining model parameters of an equivalent circuit which are in close correlation with the charge/discharge condition of the battery.
63 Citations
8 Claims
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1. A method of measuring battery capacity using a voltage response signal based on a pulse current, comprising the steps of:
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measuring a voltage signal based on a pulse current signal applied to at least one end of a battery as a function of time; analyzing the measured voltage signal to determine parameters, wherein the parameters are model parameters determined from an approximation of the measured voltage signal to an impedance function obtained from an equivalent circuit comprising resistances and model parameters of a condenser; examining a correlation between the parameters and the capacity of the battery measured by a real-time discharge method; and based on the correlation, determining the unknown capacity of the battery from a voltage characteristic in response to the pulse current applied to the battery. - View Dependent Claims (2, 3, 4)
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5. An apparatus for measuring battery capacity using a voltage response signal based on an applied pulse current, the apparatus comprising:
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a measurement unit for detecting voltages between both ends of a battery based on the pulse current applied to the battery; and a central control unit for performing an approximation of the voltages output from the measurement unit to predetermined model parameters, examining a correlation between the model parameters and the capacity of the battery measured by a real-time discharge method, and determining the unknown battery capacity from a voltage characteristic in response to the pulse current applied to the battery, based on the correlation. - View Dependent Claims (6, 7, 8)
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Specification