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Coupled Electro-Chemical and Thermal Modeling for Cylindrical Lithium-ion Batteries

Automotive Research Association of India-Ravindra Kumar, Prashant Pathare, Shantanu Waman, Gargi Moharil
  • Technical Paper
  • 2019-28-2488
To be published on 2019-11-21 by SAE International in United States
The shift over of the automobile sector from the ICE to the electric drives is imminent due to arising global issues of pollution and ever rising pressure on the demand of the natural resources due to lower efficiency of the ICE drives. This has led to uprising of the Lithium-ion batteries, with addition of the burden of living to expectation of clean energy and higher efficiencies. Alongside, with limitation in the availability of the lithium-ion batteries they carry a hefty price tag with them, hence causing huddles in the research. Lack of research leads to failure of batteries and may cause life threatening situations when operating in the vehicle. In order to insight the working of the cylindrical lithium-ion batteries under different driving and environmental conditions a methodology is developed for the coupled electro-chemical and thermal phenomenon. This allows anticipating the behaviour of the battery under different conditions that influence its performance. The 18650 battery with three different chemistries i.e. Lithium Nickel Cobalt Aluminium Oxide (NCA), Lithium Nickel Manganese Cobalt Oxide (NMC) and Lithium Iron…
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Thermal Behavior Analysis of Lithium Ion Cells used in EVs and HEVs

A R A I-Aatmesh Jain
College of Engineering-Shubham Gaurishankar Lonkar
  • Technical Paper
  • 2019-28-0163
To be published on 2019-10-11 by SAE International in United States
The batteries for electric vehicles (EV) generate heat during discharging cycles. During these rapid discharge cycles the temperature of cell may increase above allowable limits. The high temperature of lithium ion cell is the primary factor affecting the cell performance and life. To develop efficient cooling mechanism for batteries, thermal behavior of secondary cell is must know. In this research, experimentally the thermal behavior analysis of cylindrical lithium ion cells at constant current discharge cycles with different current rates for each cycle is evaluated. The experiments were carried out at three discharge cycles of 1C, 2C and 3C rates and two battery chemistries namely NiMnCo and NiCoAlare considered for analysis. The instantaneous temperature of cell was measured using thermal imager and increase in overall cell surface temperature at different discharge rates, for entire discharging interval has been studied. An empirical relation for average surface temperature of cell at different current rates and depth of discharge has been obtained which may find application in defining the discharge algorithms. The rates of internal heat generation in both…

Programming Light on a Chip

  • Magazine Article
  • TBMG-34606
Published 2019-06-01 by Tech Briefs Media Group in United States

Microwave signals are ubiquitous in wireless communications but interact too weakly with photons. A technique was developed to fabricate high-performance optical microstructures using lithium niobate, a material with powerful electro-optic properties. The new integrated photonics platform can store light and electrically control its frequency (or color) in an integrated circuit. The platform draws inspiration from atomic systems and could have a wide range of applications including photonic quantum information processing, optical signal processing, and microwave photonics.

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Dynamic Correction Strategy for SOC Based on Discrete Sliding Mode Observer

CATARC-Denggao Huang, Jing Zhao, Zhongwen Zhu, Cheng Li, Jinfeng Gong
Published 2019-04-02 by SAE International in United States
Battery state estimation is one of the most important decision parameters for lithium battery energy management. It plays an important role in improving battery energy utilization, ensuring battery safety and enhancing system reliability. This paper is proposed to provide a dynamic correction of SOC in the full working condition, including static condition and dynamic condition. Based on the Coulomb-counting method, the current SOC value of the battery is calculated. Under the static conditions, the open circuit voltage of the battery is used to directly collect the initial SOC. Under the dynamic working conditions, the open circuit voltage of the battery is estimated by the sliding mode observer. Based on the deviation between the calculated and estimated values of the open circuit voltage, the current coefficient of the Coulomb-counting method is dynamically corrected by PI strategy. The research shows that the proposed strategy can effectively correct the deviation of SOC in the initial process and the discharge process, and avoid the problem that the existing “open circuit voltage + Coulomb-counting” method cannot dynamically correct the SOC…
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Battery Current Control Algorithms in an Electric Two Wheeler

Ather Energy-Shivaram Venkateswaran, Lokesh Soni
Published 2019-01-09 by SAE International in United States
Various current control algorithms are presented in this paper to prevent vehicle cut-off and increase the range of an electric 2 wheeler based on SoC, battery temperature and motor temperature. At lower SoCs if the current demand is very high there is a possibility of cell voltage hitting the lower threshold voltage leading to cut-off. An algorithm is proposed where current (maximum allowed) derating is done based on reducing SoC, battery voltage and real time throttle demand.Lithium ion cells operating temperature has an upper cap. Rate of increase of battery temperature mainly depends on current demand by motor while the initial battery temperature also depends on ambient temperature. To prevent the battery temperature from reaching the upper threshold a battery temperature based current (maximum allowed) derating algorithm is used.As one algorithm affects the other, this leads to Multi Input Single Output (MISO) system configuration. Both the algorithms along with motor fan control based on motor temperature are clubbed. Model developed in Matlab/Simulink is implemented on real vehicle and data is compared/analyzed.
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Honda R&D Technical Review October 2018

  • Book
  • B-HON-024
Published 2018-10-01 by Honda Motor Co., Ltd. in Japan

Honda's October 2018 R&D Technical Review features cutting-edge developments and new ways of solving engineering problems. Research papers related to Honda R&D Center activities worldwide cover the work of engineering teams in automobile, motorcycle, power products, aircraft engine, and other fundamental technologies. This edition brings 15 technical papers and provides featured topics that include: • Development of the 2018 Gold Wing • Intelligent Power Unit for the 2018 Model Year Accord Hybrid • Analysis of Capacity Fading for High-Power Lithium Ion Rechargeable Batteries

Graphene Oxide Nanosheets for Lithium-Metal Batteries

  • Magazine Article
  • TBMG-32489
Published 2018-08-01 by Tech Briefs Media Group in United States

Lithium-metal batteries — which can hold up to ten times more charge than lithium-ion batteries — haven't been commercialized because of a fatal flaw: as the batteries charge and discharge, lithium is deposited unevenly on the electrodes. This buildup cuts the lives of these batteries too short to make them viable, and more importantly, can cause the batteries to short-circuit and catch fire.

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Aviation Visual Distress Signals (AVDS)

S-9A Safety Equipment and Survival Systems Committee
  • Aerospace Standard
  • AS5134B
  • Current
Published 2018-06-12 by SAE International in United States
This SAE Aerospace Standard (AS) provides minimum performance and design standards for a handheld, high-intensity, flashing Aviation Visual Distress Signal (AVDS) based on light-emitting-diode (LED) technology operating simultaneously in visible (white) and near infrared (NIR) spectra designed to facilitate location and rescue of aviation accident/ditching survivors in open sea conditions.
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Q&A: Dr. Yimei Zhu, Senior Physicist, Brookhaven National Laboratory, Upton, NY

  • Magazine Article
  • TBMG-28865
Published 2018-05-01 by Tech Briefs Media Group in United States

Researchers at Brookhaven National Laboratory have observed how lithium moves inside individual nanoparticles that make up batteries. The finding could help companies develop batteries that charge faster and last longer.

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Lightweight Carbon Composite Chassis for Engine Start Lithium Batteries

SAE International Journal of Materials and Manufacturing

Meggitt Composites-Dennis Moxley
Meggitt PLC-Thomas Black
  • Journal Article
  • 05-11-01-0003
Published 2018-03-07 by SAE International in United States
The supersession of metallic alloys with lightweight, high-strength composites is popular in the aircraft industry. However, aviation electronic enclosures for large format batteries and high power conversion electronics are still primarily made of aluminum alloys. These aluminum enclosures have attractive properties regrading structural integrity for the heavy internal parts, electromagnetic interference (EMI) suppression, electrical bonding for the internal cells, and/or electronics and failure containment. This paper details a lightweight carbon fiber composite chassis developed at Meggitt Sensing Systems (MSS) Securaplane, with a copper metallic mesh co-cured onto the internal surfaces resulting in a 50% reduction in weight when compared to its aluminum counterpart. In addition to significant weight reduction, it provides equal or improved performance with respect to EMI, structural and flammability performance. This application of the technology outlined in this paper pertains to an engine-start battery chassis. However, strategically embedding metallic mesh within composite materials may be utilized in numerous other applications of aviation electronics enclosures.
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