Measurement of the internal cell temperature via impedance: Evaluation and application of a new method

作者：Schmidt Jan Philipp^*; Arnold Stefan; Loges Andre; Werner Daniel; Wetzel Thomas; Ivers Tiffee Ellen

来源：Journal of Power Sources, 2013, 243: 110-117.

DOI：10.1016/j.jpowsour.2013.06.013

• Temperature
• Lithium-ion
• EIS
• Measurement
• Ohmic resistance
• Impedance

Sensorless online temperature measurement of lithium-ion cells based on electrochemical impedance spectroscopy (EIS) measurements is introduced and applied to a commercial 2 Ah pouch cell. The method%26apos;s sensitivity on temperature and state of charge (SOC) is investigated, taking a closer look to the selection of measurement frequency. The internal temperature is determined as precise as +/- 0.17 K with SOC status known and +/- 2.5 K with SOC status unknown at isothermal conditions. %26lt;br%26gt;Furthermore, the influence of a temperature gradient, as it will develop during cell operation, is studied in detail and the simulation results are validated experimentally. Finally, the method%26apos;s ability to monitor the temperature is demonstrated during a thermal cool down.

• 出版日期2013-12-1