Mechanical Frequency Response Analysis of Lithium-Ion Batteries to Disclose Operational Parameters

Hartmut Popp, Gregor Glanz, Karoline Alten, Irina Gocheva, Wernfried Berghold and Alexander Bergmann
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Hartmut Popp: Center for Low-Emission Transport, AIT Austrian Institute of Technology, 1210 Vienna, Austria
Gregor Glanz: Center for Low-Emission Transport, AIT Austrian Institute of Technology, 1210 Vienna, Austria
Karoline Alten: Center for Mobility Systems, AIT Austrian Institute of Technology, 1210 Vienna, Austria
Irina Gocheva: Center for Low-Emission Transport, AIT Austrian Institute of Technology, 1210 Vienna, Austria
Wernfried Berghold: Center for Low-Emission Transport, AIT Austrian Institute of Technology, 1210 Vienna, Austria
Alexander Bergmann: Institute of Electronic Sensor Systems, Graz University of Technology, 8010 Graz, Austria

Energies, 2018, vol. 11, issue 3, 1-13

Abstract: During the charge and discharge process, lithium-ion batteries change their mechanical properties due to internal structural changes caused by intercalation and de-intercalation of the ions in the anode and cathode. Furthermore, the behavior changes over the lifetime of the battery due to several degradation mechanisms. The mechanical properties of the cell hold valuable information for monitoring these changes and additionally provide data for mechanical construction and further optimization of battery systems. Hence, in this manuscript, the mechanical frequency response function is investigated as a non-destructive method to determine parameters such as stiffness and damping of pouch cells and their correlation with the state of charge (SOC), the state of health (SOH), and the temperature of the cell. Using a mechanical shaker and an impedance head, it is shown that low amplitude forces of only a few Newton and a low frequency region of several hundred Hertz already suffice to show differences in the state of charge and state of health as well as in mechanical properties and the dependencies on temperature. Also the limitations of the method are shown, as the frequency response is not distinct for each parameter and thus, at the moment, does not allow absolute determination of a single value without prior system knowledge.

Keywords: lithium-ion battery; modal analysis; mechanical excitation; state of charge; state of health; temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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