Thermal diffusivity study of aged Li-ion batteries using flash method

The specifications that define an automotive development project are established at an early point in the process and define the direction of such a development, and changing these decisions becomes more costly the further the project progresses. Tools to enable better consideration of choice can help prevent this. The tool presented is designed to aid with the decisions needed when embarking on the development of a vehicle that incorporates electric-vehicle technologies and the important choices made regarding the battery pack required by such a vehicle. The tool incorporates a sizing model for determining the number of cells and the configuration required to meet a specified battery requirement. The tool then uses a 1-d model to determine some of the basic thermal and power characteristics that can then be used to inform other parts of the design specification. When attached to a database containing cell information, the tool can pre-select candidate cells to meet the requirement, and rapid execution time of the tool means that it can be used to quickly compare between cell choices, at a level understandable by all stakeholders in the decision making process.

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“…The parallel strings determined by energy requirement are calculated by (2) or by power requirement as…”

Section: Pack Sizingmentioning

confidence: 99%

“…This leads to other requirement specifications such as sizing, technologies to use and other more engineering aspects of the initial design [2].…”

Section: Introductionmentioning

confidence: 99%

Sizing tool for rapid optimisation of pack configuration at early-stage automotive product development

Taylor

Ball

McGordon

et al. 2015

WEVJ

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“…The SEI film compositions largely consist of lithium salts, such as lithium fluoride (LiF), lithium hydroxide (LiOH), lithium carbonate (Li 2 CO 3 ), lithium oxalate [(LiCO 2 ) 2 ], lithium methyl carbonate (LiOCO 2 CH 3 ), lithium ethyl carbonate (LiOCO 2 C 2 H 5 ), and other materials (Tasaki et al 2009). Nagpure et al (2010) studied the surface potential of continuously cycled batteries and briefly cycled batteries using Kelvin probe microscopy (KPM), and reported that the mean values of surface potential on the continuously cycled surface were lower than that of the briefly cycled. The difference in surface potential was attributed on the deposition of the passive SEI film on the continuously cycled cathode, resulting in capacity loss in the battery.…”

Section: Introductionmentioning

confidence: 99%

Remanufacturing cathode from end-of-life of lithium-ion secondary batteries by Nd:YAG laser radiation

Liu

Zhang

Qing

et al. 2015

Clean Techn Environ Policy

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The electric vehicle industry has been rapidly developing internationally. Electric vehicle batteries (EVBs) are perceived as a low environmental impact energy storage technology. While the service life of an EVB is relatively long, a significant number of battery packs will reach the end of their service lives eventually. The end-of-life (EOL) EVBs may still have appreciable residual value for remanufacturing and secondary use. Some solid-electrolyte interface (SEI) layers will persist on the surface of electrodes deposit after a period of continuous cycling, causing the battery degradation and failure. An approach to battery end-of-life management was introduced involving remanufacturing of the cathode from EOL lithium-ion battery electrodes, and a recent study on remanufacturing process of the degraded EVBs using pulse laser to radiate SEI on the electrode surface was presented in this paper, here on a laboratory scale. Based on experimental data, the SEI film removal was carried out with laser energy intensity ranging from 0.035 to 0.169 J/mm 2 . The remanufactured cathodes were characterized through a combination of scanning electron microscopy, Fourier transform infrared spectroscopy, and wavelength dispersive spectrometer, respectively. The experimental results indicated that the remanufacturing treatments were successful in removing the EOL by-products (e.g., SEI films) and upgrading the cathode to its pre-cycling functionality. It is suggested that the fade capacity of a lithium-ion battery can be recovered by using laser radiation method.

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“…Lithium-ion batteries, which have high-energy storage and power density and competitive cost, have become the first choice as the power source by major EV manufacturers [2]. Although a lot of research has been conducted for lithium-ion EV batteries and various performance characteristics have been explored, the Li-ion batteries have not yet been able to simultaneously meet the intensive energy demands, long life cycle, and low cost which are unique to vehicular-propulsion applications [3].…”

Section: Introductionmentioning

confidence: 99%

Addressing human factors in electric vehicle system design: Building an integrated computational human–electric vehicle framework

Wan

Zhao

2012

Journal of Power Sources

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Thermal diffusivity study of aged Li-ion batteries using flash method

Cited by 58 publications

References 9 publications

Sizing tool for rapid optimisation of pack configuration at early-stage automotive product development

Sizing tool for rapid optimisation of pack configuration at early-stage automotive product development

Remanufacturing cathode from end-of-life of lithium-ion secondary batteries by Nd:YAG laser radiation

Addressing human factors in electric vehicle system design: Building an integrated computational human–electric vehicle framework

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