Abstract
If future electric and hybrid electric vehicle batteries are to be designed such that the impact of vibration induced resonance is minimized, engineers tasked with the design of the vehicle's energy storage system must have a rigorous understanding of key system attributes such as the natural frequencies of the cell, the level of damping present and the mode shapes induced within the battery under mechanical load. This paper describes the underpinning theory and experimental method employed when using the impulse excitation technique to quantify the natural frequencies and mode shapes of a commercially available 25 Ah Nickel Manganese Cobalt Oxide (NMC) Laminate Pouch Cell. Experimental results are presented for fifteen cells at five different values of state of charge (SOC). The results indicate that irrespective of the energy content within the cell, the same four modes of vibration (torsion and bending) exist within a frequency range of 191 Hz–360 Hz. This is above the frequency range (0–150 Hz) typically associated with road-induced vibration. The results also indicate that the cell's natural frequencies of vibration and damping do not vary with changing values of SOC.
Highlights
Within the automotive and road transport sector, one of the main drivers for technological development and innovation is the need to reduce the vehicle's fuel consumption and the emissions of carbon dioxide (CO2)
If future vehicle battery systems are to be designed such that the impact of vibration induced resonance is minimized, engineers must have a rigorous understanding of key system attributes such as the natural frequencies of the cell, the level of damping for each natural frequency and the mode shapes induced within the cell when it is under mechanical load
The authors argue that if future electric vehicle (EV) and hybrid electric vehicle (HEV) battery systems are to be designed such that the impact of vibration induced resonance is minimized, engineers must have a rigorous understanding of key system attributes such as the natural frequencies of the cell, the level of damping present and the mode shapes induced under mechanical load
Summary
Within the automotive and road transport sector, one of the main drivers for technological development and innovation is the need to reduce the vehicle's fuel consumption and the emissions of carbon dioxide (CO2). Legislative requirements are motivating vehicle manufacturers and subsystem suppliers to develop new and innovative electric vehicle (EV) and hybrid electric vehicle (HEV) concepts. Within this field, a key enabling technology is the design and integration of the high voltage (HV) battery system. The impact of mechanical vibration on the vehicle's electrical and electronic components and subsystems is known to be a major cause of in-market durability failure [1].
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