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An accurate parameter estimation becomes one of most important goals of modern battery management systems in electrical vehicles and smart grids. Actually, only state of the charge is used to analyse the battery conditions. However, information about internal resistance and capacity as well as open circuit voltage allows optimizing the battery operation mode either while charging or discharging and...
The electrochemical impedance spectroscopy (EIS) measurement is a method used for offline battery impedance spectrum measurement, which usually requires a specialized and costly equipment. Recent work presented an online method to measure the AC impedance of batteries by utilizing the DC-DC power converter that usually follows the battery for regulation purposes. In this method, the duty cycle of...
This paper presents a fast cost-effective technique for the measurement of battery impedance online in an application such as an electric or hybrid vehicle. Impedance measurements on lithium-ion batteries between 1 Hz and 2 kHz give information about the electrochemical reactions within a cell, which relates to the state of charge (SOC), internal temperature, and state of health (SOH). We concentrate...
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