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A coupled Lattice Boltzmann-Finite Volume method for the thermal transient modeling of an air-cooled Li-ion battery module for electric vehicles

Univ. Tor Vergata-Gino Bella
Univ. di Roma Niccolo Cusano-Daniele Chiappini, Laura Tribioli
  • Technical Paper
  • 2019-24-0207
To be published on 2019-08-15 by SAE International in United States
Due to their ability to store higher electrical energy, lithium ion batteries are the most promising candidates for electric and hybrid electric vehicles, whose market share is growing fast. Heat generation during charge and discharge processes, frequently undergone by these batteries, causes temperature increase and thermal management is indispensable to keep temperature in an appropriate level. In this paper, a coupled Lattice Boltzmann-Finite Volume model for the three-dimensional transient thermal analysis of an air-cooled Li-ion battery module is presented. As it has already been successfully used to deal with several fluid dynamics problems, the Lattice Boltzmann method is selected for its simpler boundary condition implementation and complete parallel computing, which make this approach promising for such applications. The standard Lattice Boltzmann method, here used only for the fluid-dynamic evolution, is coupled with a Finite Volume approach for solving the energy equation and recovering the temperature field throughout the whole domain (air, aluminum and battery). This coupled approach allows having a fully reliable control of the transient phase in conjugate heat transfer problems without introducing any…
 

One-Dimensional Modeling of a Thermochemical Recuperation Scheme for Improving Spark-Ignition Range Extender Engine Efficiency

Univ of Minnesota-Twin Cities-Darrick Zarling
Univ. of Minnesota-Twin Cities-William F. Northrop
  • Technical Paper
  • 2019-24-0066
To be published on 2019-08-15 by SAE International in United States
Vehicle electrification has accelerated as global fuel efficiency standards have become more stringent and battery costs have decreased. Although full electrification, i.e.; battery electric vehicles, may be appropriate for some light-duty vehicle applications, many vehicles will still require an engine to overcome range limitations. Range extender (REx) engine generators can be used to charge vehicle batteries as needed to meet driver demands. One advantage of REx engines is that they do not have a direct mechanical connection to the wheels and can frequently within the most efficient speed and load ranges. Therefore, REx engines provide an opportunity to implement advanced engine technologies that are more difficult to apply in conventional engine-powered vehicles. Thermochemical recuperation (TCR) schemes use exhaust waste heat to catalytically convert a portion of the fuel into a gas that has increased heating value. TCR schemes are ideal for REx architectures because they yield the most benefit at relatively high engine load and because they do not respond well to rapid transients. This paper explores a TCR scheme for a 2-cylinder BMW spark-ignition…
 

Modelling of a Spark Ignition Engine with Turbo-Generator for Energy Recovery

Istituto Motori CNR -Napoli-Luigi De Simio, Sabato Iannaccone
NETCOM group -Napoli-Fabio Arminio
  • Technical Paper
  • 2019-24-0084
To be published on 2019-08-15 by SAE International in United States
Increasingly stringent regulations in the field of pollutant and CO2 are forcing engine manufacturers to adopt new solutions to contain exhaust emissions, such as Hybrid Electric Vehicles (HEV) or Full Electric Vehicles (FEV). Still far from the wide diffusion of FEV limited from electrochemical storage systems together with the difficulty of creating adequate infrastructure distributed throughout the territory to recharging batteries, at present HEVs seems to be a better solution. The hybrid vehicle is already able to guarantee satisfactory autonomy and low pollution levels by combining the advantages offered by the two technologies of thermal and electric propulsion. Currently on the market there are several types of hybrid vehicles, with different degree of hybridization (depending of the electric power of the motor generators installed), capacity to store electricity and type of scheme constructive adopted for the integration between the thermal engine and the electric machines. A particular interest is getting the mild-hybrid (or light hybridization) and the micro-hybrid (or minimum hybridization) with 48V electrical system added to the common 12V one. In this field, a…
 
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The New Challenges of NVH Package for BEVs

Autoneum Holding AG-Grégoire Lepoittevin, Jan Horak, Davide Caprioli
Published 2019-06-05 by SAE International in United States
Battery electric vehicles (BEVs) bring new challenges when it comes to NVH package development, which are affected by many new factors. The noise sources from the powertrain are different, for instance due to the presence of tonal components, strong harmonics and potential whining noise. Another important aspect is the missing effect of masking noise from a combustion engine. As a consequence, other noise sources, such as tires, become more predominant. This means that the NVH package has to be re-engineered considering new noise sources and cannot just be significantly decontented in general. At the same time, NVH package weight reduction should at least partly counterbalance the vehicle weight increase due to the presence of a large and heavy battery pack in order to maximize the driving range. In the early days of BEVs, OEMs mostly carried over technologies used on combustion engine vehicles to electric cars. With the development growth of specific vehicle platforms for electric cars, NVH strategies and technologies might strongly change.The aim of this paper is to discuss the future NVH package…
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Impact-Resistant Battery Electrolyte Solidifies When Hit

  • Magazine Article
  • TBMG-34633
Published 2019-06-01 by Tech Briefs Media Group in United States

Lithium-ion batteries commonly used in consumer electronics are notorious for bursting into flame when damaged or improperly packaged. Inspired by the unusual behavior of some liquids that solidify on impact, researchers have developed a practical and inexpensive way to help prevent these fires.

 
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Battery Electrolyte Doubles Driving Range for Electric Vehicles

  • Magazine Article
  • TBMG-34610
Published 2019-06-01 by Tech Briefs Media Group in United States

Conventional electrolytes used in lithium-ion batteries that power household electronics like computers and cellphones are not suitable for lithium-metal batteries. Lithium-metal batteries that replace a graphite electrode with a lithium electrode are the holy grail of energy storage systems because lithium has a greater storage capacity and, therefore, a lithium-metal battery has double or triple the storage capacity. That extra power enables electric vehicles to drive more than two times longer between charges.

 
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Ford amped for new phase of hybrid-electric offensive

Automotive Engineering: June 2019

Bill Visnic
  • Magazine Article
  • 19AUTP06_12
Published 2019-06-01 by SAE International in United States

With the persistent auto-industry question of how soon battery electric vehicles will become mainstream options, Ford is preparing to widely deploy its fourth-generation hybrid-electric vehicle (HEV) technology that Dave Felipe, the VP of powertrain engineering, said will result in a fuel-efficient, performance-rich HEV variant for “all mainstream models” in North America.

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Scientists 3D Print All-Liquid ‘Lab on a Chip’

  • Magazine Article
  • TBMG-34552
Published 2019-06-01 by Tech Briefs Media Group in United States

Researchers at DOE's Lawrence Berkeley National Laboratory (Berkeley Lab) have 3D printed an all-liquid device that, with the click of a button, can be repeatedly reconfigured on demand to serve a wide range of applications — from making battery materials to screening drug candidates.

 
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Eliminating Corrosion Extends Life of Lightweight Batteries

  • Magazine Article
  • TBMG-34618
Published 2019-06-01 by Tech Briefs Media Group in United States

Metal-air batteries are one of the lightest and most compact types of batteries but when not in use, they degrade quickly, as corrosion eats away at their metal electrodes. While typical rechargeable lithium-ion batteries only lose about 5 percent of their charge after a month of storage, they are too costly, bulky, or heavy for many applications. Primary (non-rechargeable) aluminum-air batteries are much less expensive and more compact and lightweight, but they can lose 80 percent of their charge a month.

 
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A Method to Calculate the Energy Impact of Interactions between Vehicle Subsystems

Jaguar Land Rover Automotive PLC-Abbas Tourani, Mike Howe, Andy Bailey
Published 2019-05-06 by SAE International in United States
In connection with the increasing energy and environment challenges, the automotive industry has been investing heavily on improving the energy efficiency of vehicles. Although the electrification of powertrain is the principal path towards reducing fossil fuel dependency, a greater understanding of the fuel energy utilisation on the vehicle (here intended as a ‘system’) is necessary to identify the readily available opportunities for efficiency improvements and ultimately develop cars which are more energy efficient. The energy efficiency or loss map of a vehicle’s components is often obtained experimentally from test rigs. The impact of any change in the efficiency or loss maps of a component on the other components of the vehicle and the total energy losses should be examined in the vehicle system level. In this article, a systematic approach is used to study the interrelation between the component losses and the total vehicle energy loss. A new method is proposed to determine a component energy loss due to its position in the energy flow from the energy source (the battery or fuel tank) to…
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