Sensorless battery temperature measurements based on electrochemical impedance spectroscopy

A new method is proposed to measure the internal temperature of (Li-ion) batteries. Based on electrochemical impedance spectroscopy measurements, an intercept frequency (f0) can be determined which is exclusively related to the internal battery temperature. The intercept frequency is defined as the...

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Vydáno v:Journal of power sources Ročník 247; s. 539 - 544
Hlavní autoři: Raijmakers, L.H.J., Danilov, D.L., van Lammeren, J.P.M., Lammers, M.J.G., Notten, P.H.L.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier 01.02.2014
Témata:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Temperature measurement
Lithium ion batteries
Lithium ion battery
Internal battery temperature
Sensorless control
Secondary cell
Electrochemical impedance spectroscopy
Intercept frequency
Sensorless temperature measurement
ISSN:0378-7753
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Shrnutí:A new method is proposed to measure the internal temperature of (Li-ion) batteries. Based on electrochemical impedance spectroscopy measurements, an intercept frequency (f0) can be determined which is exclusively related to the internal battery temperature. The intercept frequency is defined as the frequency at which the imaginary part of the impedance is zero (Zim = 0), i.e. where the phase shift between the battery current and voltage is absent. The advantage of the proposed method is twofold: (i) no hardware temperature sensors are required anymore to monitor the battery temperature and (ii) the method does not suffer from heat transfer delays. Mathematical analysis of the equivalent electrical-circuit, representing the battery performance, confirms that the intercept frequency decreases with rising temperatures. Impedance measurements on rechargeable Li-ion cells of various chemistries were conducted to verify the proposed method. These experiments reveal that the intercept frequency is clearly dependent on the temperature and does not depend on State-of-Charge (SoC) and aging. These impedance-based sensorless temperature measurements are therefore simple and convenient for application in a wide range of stationary, mobile and high-power devices, such as hybrid- and full electric vehicles.
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ISSN:0378-7753
DOI:10.1016/j.jpowsour.2013.09.005