How exactly do Battery Electric Vehicles work? The quick answer is pretty straightforward, in theory. However, before we get into the actual nuts and bolts, let’s establish the different types of electrified vehicles we’re talking about.
Types of Electrified Vehicles
There are four types of electrified vehicles on the road. Electrified, because they all use an electric motor as a motive force in some way:
Hybrid Electric Vehicles (HEVs) combine two sources of power – a gas engine and electric motor – and automatically choose the best blend of power. The battery recharges on the go, so HEVs never need to be plugged in.
Plug-in Hybrid Electric Vehicles (PHEVs) operate similarly to an HEV, only with a larger battery, providing the ability to travel quicker and further on electric power alone. The battery recharges on the go, but can also be plugged in to extend electric-only driving range.
Fuel Cell Electric Vehicles (FCEVs) use hydrogen as an energy source to generate electricity onboard, that is then used to power an electric motor or motors. With water vapour as the only tailpipe emission, this electrified vehicle requires no plugging-in, just refills of hydrogen fuel where refueling infrastructure exists.
Battery Electric Vehicles (BEVs) emit no exhaust from the tailpipe and are powered by electricity alone, which is stored in a large onboard battery. BEVs must be plugged-in to receive a full charge and full range.
Pure Battery Electric Vehicles, or BEVs, are what we’ll focus on in this post.
How Battery Electric Vehicles Work?
In place of a gas (internal combustion) engine, Battery Electric Vehicles are powered by an electric motor or motors. These motors are, in turn, powered by electricity that is stored onboard in a large battery pack (more on that in a bit). Because they don’t use gas, BEVs produce zero tailpipe emissions. Here’s a closer look at the parts that keep a BEV moving.
Traction Batteries
The real power behind an electrified vehicle is the traction or deep cycle battery. Usually lithium-ion, traction batteries are designed to provide power over a sustained period of time. This is in contrast to a Starting, Lighting and Ignition (SLI) battery, which provides a lot of power at once, and usually for a single or limited purpose like starting a car.
The size of the battery is what determines how far and how fast an electrified vehicle can go on electric power alone. It should come as no surprise that a BEV battery is larger than a PHEV battery -- up to 10 times -- which in turn can be up to 10 times larger than an HEV battery.
Another key factor is the flow of energy from the battery to the motor, and from recharging sources back to the battery. This is known as the charge / discharge cycle. Over time, the number of cycles a battery goes through will impact both battery life and vehicle performance.
A smaller, lighter HEV battery, for example, might charge / discharge several times on a short errand; and can go through 100,000 or more cycles in its lifetime.
A PHEV battery, with its greater EV speed and range, might go through a cycle once or twice a day, and up to 8,000 or more in its lifetime.
A BEV battery rarely sees a full charge / discharge except on longer journeys, and might see only 1,000 cycles in its lifetime.
Power, Performance, and Range
Beyond how a battery electric vehicle works, what most people considering a BEV want to know is how efficient it is, how far it can go on a single charge, and how long the battery will last. To understand all of that, you need to understand some key terms:
Kilowatt (kW)
A watt is a unit of electrical power. A kilowatt (kW) is 1,000 watts and is used to measure the power of the electric motor. Think of it as the equivalent of horsepower (HP), which is the measure of the power of a conventional gas engine.
In fact, you can translate kW into HP by multiplying the kilowatts by 1.34. For example, the Toyota bZ4X has a 149 kW engine, which translates into 203 HP.
Kilowatt Hour (kWh)
A kilowatt hour (kWh) is used to measure the capacity of the battery that supplies the electric motor. In other words, how many hours it can deliver its power to the electric motor. Think of it as the equivalent of the amount of energy contained in a tank of gas.
By way of example, if you had an electric motor rated at 100 kW, and ran it for 30 minutes, you would use 50 kWh of energy (100 x 0.5).
How Far on a Single Charge?
There is no one answer to this question. Each BEV will have published figures based on standard tests. For example, the Toyota bZ4X Front Wheel Drive models have a travel range of up to 406 km[¹], on a full charge and under ideal conditions.
However, many things in real life driving can affect how long a charge will last, including cold weather, how fast you drive, how often you turn on your AC or the heater. All of which can drain the battery faster. As a simple rule of thumb, the larger the battery, the greater the range.
Charging a BEV
Charging a BEV is simple. Just plug it in. Charging times will vary depending on the type or speed of charging point you are using:
- Level 1 Charging: A standard 120-volt AC wall socket. This is the slowest way to charge, but requires no special equipment.
- Level 2 Charging: A 240-volt AC outlet can cut BEV charging times by about half. These are found at most public charging station, or you can have one installed at home.
- Level 3 Charging: A 480-volt DC charger can charge a BEV in as fast as one hour. This is currently the fastest method of charging a BEV.
Canada has more than 5,000 public charging stations – 500 of which have Level 3 fast chargers.
How Long Do Electric Batteries Last?
Batteries for electrified vehicles, including HEVs, PHEVs, FCEVs and BEVs are designed to last the lifetime of the vehicle. At Toyota, BEVs come with an 8-year or 160,000 km Battery and Battery Capacity warranty (whichever comes first) [2]
Toyota goes one step further with its HEV and PHEV batteries, providing a 10-year or 240,000 kms warranty (whichever comes first).
Advantages of Battery Electric Vehicles
Like every type of electrified vehicle, how a fits into each lifestyle might differ from driver to driver, depending on where you live, how you drive, and the uses to which you put your vehicle. Here’s a few of each to keep in mind.
- Advantage: Emissions-Free Driving - With no tailpipe emissions, a BEV can help reduce greenhouse gas emissions, and lessen our impact on the environment.
- Advantage: Instant Acceleration - Electric motors provide instant torque, which provides quick, seamless acceleration. They are also exceptionally quiet.
- Advantage: Electric-only Range - Modern BEVs can travel further than you might think, which means you can travel significant distances between the need for charging.
- Advantage: Lower Fuel Costs - Electricity could be cheaper than gas. Savings can be even higher if you recharge during off-peak hours.
- Advantage: Lower Maintenance Costs - BEVs have fewer mechanical parts than conventional gas vehicles, which can mean less service and maintenance costs over the lifecycle of the vehicle.
- Advantage: Financial Incentives - Several provincial governments, as well as the federal government, offer incentives for the purchase of a zero emissions vehicle. Visit Transport Canada to learn more.
The Future of Electrification
The future of electrified vehicles, especially BEVs, are charging ahead. In 2022, there are 47 BEV offerings in Canada.
This growth is driven by greater consumer acceptance and demand, as well as increasingly stringent government regulations and mandates – both around the world, and here at home. Several provinces, including British Columbia and Quebec have set zero-emission vehicle mandates. And federally, Canada continues to be committed to reducing greenhouse gas emissions from all light-duty vehicles.
Every major auto manufacturer is invested in offering an increasing number of electrified vehicles to cater to Canadian needs. This includes Toyota.
Our electrification path includes HEVs, PHEVs, BEVs, and Hydrogen Fuel Cell Electric Vehicles (FCEVs). This stems from a belief that there isn’t just one electrified solution that can meet the needs and wants of every customer in every market – and it’s the choice of offerings that will ultimately support us in achieving a more sustainable future.
Choosing An Electrified Vehicle That is Right for You
Furthermore to the above BEV considerations, if you are considering an electrified vehicle of any kind, you can see that a lot goes into that decision. From where you live, to how you drive, to availability of charging stations, and more. To help narrow down your choice, try our Powertrain Quiz. And take a look at the full range of Toyota electrified options. There’s sure to be one to meet your needs.
Disclaimers
[¹] NRCan-estimated 406 KM total driving range for bZ4X FWD when vehicle is fully charged and operated under ideal driving conditions. Use for comparison purposes only. Actual range may decrease significantly depending on speed, outside temperature, accessory use, how/where you drive, charging habits, and other factors. Battery capacity also decreases with time and use which will reduce range. See www.nrcan.gc.ca and Owner’s Manual for details.
[2] Whichever comes first. See Owner’s Manual Supplement or ask your Dealer for details.
