Wiktor Wise
Electric vehicles (EVs) are automobiles that use electricity as their primary source of propulsion. They are typically powered by rechargeable lithium-ion batteries and electric traction motors. Unlike traditional internal combustion engines, electric vehicles do not emit exhaust from a tailpipe and do not contain liquid fuel components such as fuel pumps, fuel lines, or fuel tanks. The electric vehicle market is experiencing rapid growth, with increasing sales and improved performance, range, and model availability. This growth is driven by government incentives, national policies, and advancements in battery technology. As a result, electric vehicles are becoming more affordable and accessible to consumers, contributing to a more sustainable future.
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What You'll Learn
Electric vehicle batteries
Most electric vehicle batteries are lithium-based and rely on a mix of cobalt, manganese, nickel, graphite, and other primary components. The most common format is NMC, in which the electrolyte is lithium salt, the anode is graphite, and the cathode is a combination of nickel, manganese, and cobalt. Other types of rechargeable batteries used in early electric vehicles include nickel–metal hydride batteries, which were used in some electric cars made by General Motors, and lithium vanadium oxide, which was used in the Subaru prototype G4e.
The production cost of lithium-ion batteries is gradually decreasing as the technology matures and production volumes increase. The cost of electric vehicle batteries has fallen 87% since 2010 on a per-kilowatt-hour basis. In 2017, the battery pack for the Chevrolet Bolt was estimated to cost about $205 per kWh, while in 2023, Tesla's Model 3 battery pack costs $190 per kWh. This represents a drop of more than 70% in the price per kWh in 6 years.
To address the environmental impact of electric vehicle battery production, the supply chain is increasingly focusing on sustainability, with efforts to reduce reliance on rare-earth minerals and improve recycling. For example, the first commercial passenger cars are using sodium-ion batteries, which completely avoid the need for critical minerals. Additionally, the LMFP battery is an LFP battery that includes manganese as a cathode component, making it heavier but cheaper and more sustainable.
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Electric vehicle motors
Electric vehicles (EVs) have an electric motor instead of an internal combustion engine. They are powered by a traction battery pack that drives the vehicle's wheels. This is in contrast to traditional cars, which are powered by an internal combustion engine.
The electric motor is a crucial component of an electric vehicle, and it plays a significant role in its overall performance and efficiency. The motor is responsible for converting electrical energy into mechanical energy, which propels the vehicle forward. Unlike traditional cars, electric vehicles do not have a multi-speed transmission. Instead, they have a single-speed transmission, which is much simpler in design.
There are several types of electric motors used in electric vehicles, including AC induction motors, permanent magnet synchronous motors, and switched reluctance motors. Each type has its own unique characteristics and advantages. AC induction motors, for example, are known for their durability and efficiency, while permanent magnet synchronous motors offer high torque and efficiency.
The two major parts of an electric motor are the stator and the rotor. The stator is the motor's stationary outer shell, which is mounted to the chassis, while the rotor is the lone rotating element that feeds torque out through the transmission and onto a differential. The rotor interacts with the stator's magnetic field to produce rotational motion, which is then transferred to the wheels through the drive train.
Electric motors have only one moving part, but they can vary in design and complexity. Some vehicles use motor generators that perform both the drive and regeneration functions. Additionally, electric motors are also generators, which means that they can capture and convert kinetic energy back into electrical energy during braking or deceleration. This process, known as regenerative braking, helps to extend the range of electric vehicles and improve their overall efficiency.
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Electric vehicle types
Electric vehicles (EVs) are cars, SUVs, or trucks that use electricity as their primary source of power. There are four main types of electric vehicles: BEVs, PHEVs, HEVs, and FCEVs. Each type has its own unique characteristics, operational dynamics, and suitability for different use cases.
Battery Electric Vehicles (BEVs), also known as "all-electric vehicles", are powered solely by electricity. The electricity comes from rechargeable battery packs, which are charged from the grid or a domestic electricity supply. BEVs do not have a gasoline engine and produce zero tailpipe emissions, making them environmentally friendly. They are also mechanically simple, with fewer moving parts than traditional cars, resulting in lower maintenance costs. BEVs are known for their distinctive, futuristic look, silent operation, and responsive handling. Examples of popular BEV models include the Tesla and Chevy Bolt.
Plug-in Hybrid Electric Vehicles (PHEVs) combine a traditional gasoline or diesel engine with an electric motor. PHEVs can be charged by plugging into an external power source or through regenerative braking. They offer the flexibility of using electric mode for shorter journeys and switching to the conventional engine for longer trips. PHEVs typically have larger batteries than regular hybrids, resulting in a longer electric range. Some popular PHEV models include the Mitsubishi Outlander, Volvo XC60 Recharge, and Volkswagen Passat GTE.
Hybrid Electric Vehicles (HEVs), often referred to as simply "hybrids", utilize both electric and gasoline power. HEVs cannot be plugged in to charge and instead recharge their batteries through regenerative braking or via an onboard generator. They typically have smaller battery packs and a limited electric-only driving range compared to PHEVs. However, their gasoline engine provides additional range, allowing them to travel longer distances on a single tank of gas. HEVs are more fuel-efficient than traditional gasoline vehicles and are a cost-effective option for those looking to reduce their carbon emissions.
Fuel Cell Electric Vehicles (FCEVs) are similar to BEVs in that they only use an electric motor to drive the vehicle. However, FCEVs differ in that they generate electricity through hydrogen fuel cells, producing water vapor as a byproduct. FCEVs offer an excellent driving range of around 300 miles per tank of hydrogen, but they face limitations due to the high cost of hydrogen production and the lack of infrastructure for fueling stations.
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Electric vehicle history
The history of electric vehicles (EVs) dates back to the 19th century, with the first prototype created over 100 years ago. Early pioneers in the field include Ányos Jedlik, Robert Anderson, Sibrandus Stratingh, Christopher Becker, and Thomas Davenport, who developed the first prototypes of electric vehicles between 1828 and 1839. These early attempts lacked a rechargeable power source and a fully developed electric engine, relying on non-rechargeable primary cells.
In the second half of the 19th century, French and English inventors built some of the first practical electric cars. The first successful electric car made its debut around 1890, thanks to William Morrison, a chemist from Des Moines, Iowa. Morrison's six-passenger vehicle had a top speed of 14 miles per hour and helped spark interest in electric vehicles. Thomas Parker built the first electric vehicle in Europe in 1884, which could carry passengers and was powered by a lead-acid battery.
The late 19th century also saw the development of rechargeable batteries, with the invention of the lead-acid battery by French physicist Gaston Planté in 1859. This was later improved by French scientist Camille Alphonse Faure in 1881, increasing the capacity of the batteries and enabling their industrial-scale manufacture. In 1881, Gustave Trouvé tested what is likely the first human-carrying electric vehicle with its own power source, the Trouvé Tricycle, on the streets of Paris.
The early 20th century saw a decline in the popularity of electric vehicles due to their high cost, low top speed, and short range compared to internal combustion engine vehicles. However, electric vehicles continued to be used for loading, freight, and public transport, particularly rail vehicles. The introduction of the Toyota Prius in 1997 marked another turning point, as it became the world's first mass-produced hybrid electric vehicle. The rise of Tesla Motors and the increasing concern over environmental issues have also contributed to the growing popularity of electric vehicles in recent years.
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Electric vehicle market
The electric vehicle (EV) market is a dynamic sector in the clean energy space, with robust growth in recent years. In 2023, global sales of plug-in electric cars reached 14 million, accounting for 18% of new car sales, up from 14% in 2022. This growth is expected to continue, with EVs predicted to make up over one-fifth of global car sales in 2024. China leads the world in EV stock, with 5.5 million units sold as of December 2020, while the United States and the European Union have also seen the total cost of ownership of EVs become cheaper than that of conventional internal combustion engine (ICE) vehicles since 2020.
Several factors have contributed to the growth of the EV market. Firstly, governments around the world have implemented incentives such as tax credits and subsidies to promote the adoption of EVs and reduce air pollution and climate change impacts. Secondly, advancements in battery technology, particularly lithium-ion batteries, have improved the range, efficiency, and safety of EVs, making them more competitive with traditional ICE vehicles. Thirdly, the development of charging infrastructure, including fast-charging options, has addressed "range anxiety" and made EVs more accessible for longer journeys.
The EV market consists of several types of electric vehicles, including:
- Battery Electric Vehicles (BEVs) or all-electric cars, which are fully electric and use rechargeable battery packs as their only energy source.
- Plug-in Hybrid Electric Vehicles (PHEVs) or Hybrid Electric Vehicles (HEVs), which have both an electric motor and an internal combustion engine, with PHEVs capable of plugging into the grid to recharge.
- Range-extended Electric Vehicles (REEVs) and Fuel Cell Electric Vehicles (FCEVs), which can convert electric power from other fuels via a generator or fuel cell.
The EV market is expected to continue its strong growth, driven by ambitious policies, increasing price competition, and the need to decarbonize the road transport sector, which accounts for about one-sixth of global emissions. However, challenges remain, particularly in emerging and developing countries, where higher purchase costs and limited charging infrastructure have slowed the adoption of EVs. To address these challenges, efforts should focus on tightening fuel economy and emission standards, supporting the development of electric grids, and ensuring equitable access to charging infrastructure.
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Frequently asked questions
An electric vehicle (EV) is an automobile that uses an electric motor and battery to store electrical energy and power the vehicle.
Electric vehicles are made of similar materials to traditional cars, including metals, plastics, and glass. However, their powertrains are distinct, as they are made up of an inverter, electric traction motor, reduction drive, and traction battery.
A traction battery is a rechargeable battery pack that powers the electric motor in an electric vehicle. These batteries are typically lithium-ion, which has higher energy density, a longer lifespan, and higher power density than other batteries.
Electric vehicles work by using electrical energy stored in onboard battery packs to power an electric traction motor, which drives the vehicle's wheels. This eliminates the need for an internal combustion engine and the associated liquid fuel components, such as a fuel pump, fuel line, or fuel tank.
