Title: Comparing vibration measurements in an electric vehicle with standard vibration requirements for Li-ion batteries using power spectral density analysis
Authors: Jenny Frodelius Lang; Gunnar Kjell
Addresses: Department of Electronics, Environmental Durability, SP Technical Research Institute of Sweden, Box 857, 501 15 BORÅS, Sweden ' Department of Structural and Solid Mechanics, SP Technical Research Institute of Sweden, Box 857, 501 15 BORÅS, Sweden
Abstract: Lithium-ion batteries are common batteries in electric and hybrid vehicles. During their lifetime, the batteries will be subjected to vibrations; therefore, vibration testing is demanded by several standards. These standards differ when it comes to frequency range, acceleration levels, etc. From a vibration testing perspective, a battery pack is a complex object built as a large construction containing many small electric compounds. Therefore, the standards might vary depending on the objective of the test. Vibration measurements have been carried out in electric and gasoline vehicles during driving. These measurements are compared with the test severities proposed by the standards. It is found that the vibration test should be performed in three directions, and must contain a wide frequency content well above 200 Hz performed during one test or divided into two separate tests. This is not consistent with many of the existing standards today.
Keywords: Li-ion batteries; lithium-ion batteries; hybrid vehicles; vibration measurement; vibration analysis; vibration testing; time-forced test; vibration test standards; test track; hybrid electric vehicles; HEVs; power spectral density; vehicle vibration.
International Journal of Electric and Hybrid Vehicles, 2015 Vol.7 No.3, pp.272 - 286
Received: 24 Oct 2014
Accepted: 26 Mar 2015
Published online: 04 Sep 2015 *