| Title |
Non-Zero Intercept Frequency: An Accurate Method to Determine the Integral Temperature of Li-Ion Batteries |
| ID_Doc |
64868 |
| Authors |
Raijmakers, LHJ; Danilov, DL; van Lammeren, JPM; Lammers, TJG; Bergveld, HJ; Notten, PHL |
| Title |
Non-Zero Intercept Frequency: An Accurate Method to Determine the Integral Temperature of Li-Ion Batteries |
| Year |
2016 |
| Published |
Ieee Transactions On Industrial Electronics, 63.0, 5 |
| Abstract |
A new impedance-based approach is introduced in which the integral battery temperature is related to other frequencies than the recently developed zero-intercept frequency (ZIF). The advantage of the proposed non-ZIF (NZIF) method is that measurement interferences, resulting from the current flowing through the battery (pack), can be avoided at these frequencies. This gives higher signal-to-noise ratios (SNRs) and, consequently, more accurate temperature measurements. A theoretical analysis, using an equivalent circuit model of a Li-ion battery, shows that NZIFs are temperature dependent in a way similar to the ZIF and can therefore also be used as a battery temperature indicator. To validate the proposed method, impedance measurements have been performed with individual LiFePO4 batteries and with large LiFePO4 battery packs tested in a full electric vehicle under driving conditions. The measurement results show that the NZIF is clearly dependent on the integral battery temperature and reveals a similar behavior to that of the ZIF method. This makes it possible to optimally adjust the NZIF method to frequencies with the highest SNR. |
| PDF |
https://pure.tue.nl/ws/files/24775278/NZIF_IEEE_v21p0_Final_Submission.pdf
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