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Electric vehicles

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Electric vehicles are about 2.5 times more energy efficient than their counterparts which are powered solely by internal combustion engines. This high energy efficiency is the main reason why electric vehicles can contribute to lower the CO2 emission and energy consumption of traffic substantially. Electric vehicles have zero tailpipe exhaust emissions and thus contribute substantially to a better air quality. Additionally, electric vehicles are inherently silent and can help to reduce the noise levels in cities. However, the market share of electric vehicles is currently still very small and consists mainly of small vehicles intended for urban transport. Purchase costs of electric vehicles are high compared to similar sized ICE vehicles. These high purchase costs are predominantly caused by the high costs of the battery pack needed in the vehicle. Moreover a recharging network with sufficient coverage is not yet available in most countries.

Introduction

Electric vehicles are propelled solely by electric motors. There are three main types of electric vehicles:

  1. Battery electric vehicles
  2. Series Hybrid vehicles (see also description of Hybrid Electric Vehicles)
  3. Hydrogen Fuel cell vehicles. (see also description of fuel cells for mobile applications)

The Battery Electric Vehicle does not have an internal generator to produce electricity, all the electricity has to be obtained from the power grid. Examples are the Citroen EVie, Mitsubishi iMiev and the Think (van Agt, 2010).

The Series Hybrid vehicle can obtain its electricity from the power grid but has additionally a small internal combustion engine which serves as a generator to recharge the battery and offers an extended driving range. The combustion engine does not directly propel the vehicle. Examples are the Opel Ampera, GM Volt and the Volvo Recharge. The third group of electric vehicles are hydrogen fuel cell vehicles. These vehicles can also obtain their electricity from the power grid but in addition, the fuel cell can serve as a generator to recharge the battery, which also extends the driving range. Examples are the Honda Clarity and the Toyota FCHV. In the following we focus on battery electric vehicles.

There are three main technical differences between a car run on an internal combustion engine and an electric car:

  1. The internal combustion engine is exchanged for an electric motor.
  2. The electric motor is powered by a controller.
  3. The controller in turn is connected to rechargeable batteries, by which it is powered.

In addition, whilst an internal combustion engines contains lots of tubes, e.g. to transport the fuel, an electric engine contains a large amount of electric wiring. (Brain, 2005).

It is technically possible to convert a gasoline-powered vehicle to an electric vehicle; however, the associated costs are relatively high. (US Department of Energy, 2010) An explanation of how this conversion works can be found here.

Feasibility of technology and operational necessities

The main barriers for a wider user of electric vehicles are related to the batteries and to the recharging infrastructure. Batteries for use in electric cars are still expensive and have relatively limited driving ranges. Most existing EV need to be recharged after a maximum of 150 to 300 km. Completely recharging the batteries may take 4 to 8 hours. (US Department of Energy, 2010b). The widespread use of electric vehicles requires an extensive recharging infrastructure. The absence of this infrastructure may lead to reluctance to buy electric vehicles due to the fear of getting stranded with empty batteries.

The main technical obstacles which hamper the introduction are how to standardize the cords and connectors used for recharging, the decision to employ an on- or off-board charger and to development of an accurate state of charge meter for the battery. (Markel, 2010).

Status of the technology and its future market potential

The market share of battery electric vehicles is still very limited and comprises mainly of small vehicles intended for urban transport (van Agt, 2010). By the end of 2012 there was over 180,000 global stock of electric vehicles and global sales more than doubled from 2011 to 2012. However, this share only account for approximately 0.02% of total passenger cars globally (IEA, 2013). 38% of this stock is concentrated in the United States with Japan accounting for 24% and China next with 6.2% of the total.

Moreover, the purchase costs for electric vehicles are still relatively high due to the high costs of the required battery pack. To lower the purchase costs of the vehicle only relatively small battery packs are installed, limiting the driving range, which makes electric vehicles currently only suitable for urban transport. Nevertheless, the technology used in electric cars is largely proven and a breakthrough can be expected when the costs and weight of the battery pack are lowered sufficiently. Contribution of the technology to economic development (including energy market support)

Depending on where a country sources its gasoline and how it produces electricity, electric vehicles may improve energy security, as they may lower the dependency on imported gasoline.

Contribution of the technology to protection of the environment

The energy efficiency of electric cars is about 2.5 times better than their fossil fuel counterparts, which is the main reason why electric cars can lower the greenhouse gas emissions of road traffic and reduce the demand for oil. The actual greenhouse gas emission associated with the use of battery electric vehicles depends largely on the way the required electricity has been produced. Employing coal fired electricity plants to generate the electricity will marginally lower the CO2 emissions of an electric vehicle compared to similar sized vehicles with an internal combustion engine. However, using renewable electricity will lower the greenhouse gas emissions considerably. Electric vehicles might even provide a way to make the electricity sector more sustainable, if the batteries in the vehicles could be used to store the variable output of wind and solar-based power generation (Nieuwenhout et al, 2009).

Electric vehicles have no tail-pipe emission of air pollutants such as NOx and soot, which means that they can substantially contribute to improving local air quality, especially in urban areas. The global improvement of the air quality however, is determined by the way the electricity used is produced, e.g. fossil fuel fired power plants can have substantial emissions of NOx and soot when no appropriate measures are taken.

Road traffic is responsible for the majority of noise in cities. Electric vehicles are very quiet and can help to reduce noise levels in cities.

In the long-term electric vehicles are important for countries seeking to decarbonise the transport sector. Figure ? below highlights the important role that the transport sector will play in a future energy system that would limit the rise in global temperatures to 2⁰C by 2050 under the IEAs “2DS” scenario. In this scenario the transport sectors potential share of CO2 reductions would be 21% by 2050. To meet this target 75% of all vehicle sales by 2050 would need to be plug-in electric.

Financial requirements and costs

The high cost of an electric vehicle over the conventional alternative is mainly determined by the costs of the lithium ion battery pack. Recent developments in lithium-ion batteries make it likely that these additional costs can be reduced from the current level of about €15,000 in prototypes to an expected level of around €3,000 in 2020. This requires the battery to be about €200-250 per kWh (Nieuwenhout et al, 2009). The 2007 prices for high energy batteries range from €800/kWh to €1000/kWh (Pesaran et al, 2009). The medium term cost goals of these batteries are €500/kWh in 2012 and €300/kWh in 2016. BYD’s first commercial electric car, the E6 model, is expected to be available for sale in the US for 40’000 USD in 2010. (People’s Daily Online, 2010)

In addition, there is a need for investment into the recharging infrastructure. This infrastructure needs to be standardized in a way that every brand of electric vehicle can recharge at every recharging station. A simple recharging point at a private house or at an office site costs about $ 1800,-. However, a public recharging station, with the necessary electronics to make contact with the bank is estimated to cost about $ 18.000,-. (Roeterdink, 2010).

Clean Development Mechanism market status

Project developers of projects deploying electric vehicles can use the following CDM methodology: AMS-III.C.: Emission reductions by electric and hybrid vehicles.

References

Author affiliation: Energy research Centre of the Netherlands (ECN), Policy Studies

Collection:

Electric vehicles

  • Unique Electrospinning Process and Compositions for High-Volume Silicon Nanowire Production

    Type: 
    Product

    Scientists at North Dakota State University (NDSU) have developed a unique process for high-volume production of silicon nanowires based on electrospinning. The technology can be used for the development of lithium ion batteries with significantly improved energy densities and long life consistent with performance targets established by the US Department of Energy for plug-in hybrid electric vehicles.

  • Voltage-Gated Bipolar Transistor for Power Switching Applications

    Type: 
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    Objective:

    A recent GBI Research report on the Discrete Power Semiconductor device market (forecasting up to 2020) shows an increased demand from the Hybrid Electric Vehicles Solar and Wind Energy markets. Although the majority of the market is dominated by Silicon MOSFETs and Insulated Gate Bipolar Transistors (IGBT) Silicon Carbide (SiC) has emerged as a viable replacement due to its advantages over conventional Silicon devices.

  • Integration of 1-D MnO2 Nanowire and 2-D Graphene to 3-D Composites and their Applications in High-Energy High-Power and Low-Cost Aqueous Supercapacitors

    Type: 
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    Objective:

    Background: Currently MnO2 is commonly coated onto current collectors to form very thin films with a thickness of ten to one-thousand nanometers in order to minimize the limitation of poor conductivity. Therefore the relative amount of MnO2 on current collector is always low and does not provide sufficient energy and power density.

  • A Method for Synthesis of Phosphate-Based Materials

    Type: 
    Product

    Lithium-ion battery technologies are ideal candidates to be deployed in electric vehicles and consumer electronics due to their electrochemical properties stability and low-cost. This technology showcases novel phosphate-based cathode materials with different morphologies and a methodology to develop them for various applications. By using appropriate low-cost phosphonate chelating agents with sol-gel synthesis methods phosphate-based materials of porous or hollow architectures can be manufactured.

  • Transformation enabled nitride magnets absent rare earths (TEN Mare)

    Type: 
    Product
    Technology:

    Case Western Reserve University under an ARPA-E funded proof-of-concept project is developing a component-level technology innovation that will eliminate rare earth elements in permanent magnet materials for wind turbine generators and electric vehicle motors. Specifically Dr. David Matthiesen and his team is fabricating bulk powders fully transformed to α’’-Fe16N2 an ordered martensite. These highly magnetic iron-nitride alloys can be used in the magnets that power electric motors found in EVs renewable power generators such as wind turbines and vehicle accessory motors.

  • Topology Identification in Distribution Network with Limited Measurements

    Type: 
    Product
    Technology:

    Background: Need a reliable and low cost way to detect changes in the status of switching devices especially circuit breakers in distribution networks. Technology Description: This invention considers a distribution system with circuit breakers and very few sensors which do not need to be located at the circuit breakers. The number of sensors is assumed to be much smaller than is needed for classic state estimation. Using tools from machine learning the proposed invention is able to detect whether the circuit breakers switched from their nominal setting.

  • Storage and supply of electrical energy

    Type: 
    Product

    ETV mission is to develop a disruptive high-performance battery technology to provide the quantum leap to the emerging industry of Electric Vehicles and Hybrid or Plug-in Hybrids. The new technology enables 50-100% higher energy and power density with cost reduction of 25-30% vs state-of-the-art lithium batteries. ETV Energy implements in its cells a new cathode material providing high cell voltage excellent safety high cycle-life and relatively low cost of the raw material. (Cathode the positive electrode in a cell). Since the voltage of ETV cell is 4.7V vs.

  • A Pomegranate-Inspired Design for Large-Volume-Change Lithium Battery Anodes

    Type: 
    Product

    Stanford researchers have designed a novel pomegranate inspired hierarchical structure which improves the energy density cycle life Coulombic efficiency and cost efficiency of silicon-based anode for Li-ion Li-O2 and Li-S batteries. The prototype successfully demonstrated superior cycle life (1000 cycles with 97% capacity retention) low electrode/electrolyte contact area for improvement of Coulombic efficiency and increased tap density.

  • Electronic circuit for measuring series-connected electrochemical cell voltages and heating energy storage devices (batteries) for hybrid and electric vehicles

    Type: 
    Product

    Project ID: ENG0098A Invention Description and Novelty: A common requirement for large stacks of electrochemical cells used in electric and hybrid vehicles is the need to measure individual or groups of cell voltages almost simultaneously. The principal problem with current techniques of voltage measurement is that a small error in measuring the nodal voltages translates into a large relative error in the measurement of segment voltages. This technology provides an electronic circuit for measuring voltage signals in an energy storage device.

  • Receiver-Position-Controlled Field Focusing for Dynamic Inductive Power Transfer Systems

    Type: 
    Product

    Background:Wireless power transfer (WPT) based on magnetic coupling is becoming widely accepted as a means of transferring power over small to medium distances. WPT systems show promise for charging electric vehicle batteries electronic devices and other technologies. Stationary wireless charging systems have relatively high efficiencies (>90%) if the source and receiver coils are well aligned.