Batteries for Electric Vehicles

Energy storage systems, usually batteries, are essential for all-electric vehicles, plug-in hybrid electric vehicles (PHEVs), and hybrid electric vehicles (HEVs).

Types of Energy Storage Systems

The following energy storage systems are used in all-electric vehicles, PHEVs, and HEVs.

Lithium-Ion Batteries

Lithium-ion batteries are currently used in most portable consumer electronics such as cell phones and laptops because of their high energy per unit mass relative to other electrical energy storage systems. They also have a high power-to-weight ratio, high energy efficiency, good high-temperature performance, and low self-discharge. Most components of lithium-ion batteries can be recycled, but the cost of material recovery remains a challenge for the industry. The U.S. Department of Energy is also supporting the li-ion battery recycling prices to develop and demonstrate profitable solutions for collecting, sorting, storing, and transporting spent and discarded lithium-ion batteries for eventual recycling and materials recovery. Most of today's all EVs and PHEVs use lithium-ion batteries, though the exact chemistry often varies from that of consumer electronics batteries.R&D are ongoing to reduce their relatively high cost, extend their useful life, and address safety concerns in regard to overheating.

Nickel-Metal Hydride Batteries

Nickel-metal hydride batteries, used routinely in computer and medical equipment, offer reasonable specific energy and specific power capabilities. Nickel-metal hydride batteries have a much longer life cycle than lead-acid batteries and are safe and abuse tolerant. These batteries have been widely used in HEVs The main challenges with nickel-metal hydride batteries are their high cost, high self-discharge and heat generation at high temperatures, and the need to control hydrogen loss.

Lead-Acid Batteries

Lead-acid batteries can be designed to be high power and are inexpensive, safe, and reliable. However, low specific energy, poor cold-temperature performance, and short calendar and lifecycle impede their use. Advanced high-power lead-acid batteries are being developed, but these batteries are only used in commercially available electric-drive vehicles for ancillary loads.

Ultracapacitors

Ultracapacitors store energy in a polarized liquid between an electrode and an electrolyte. Energy storage capacity increases as the liquid's surface area increases. Ultracapacitors can provide vehicles additional power during acceleration and hill climbing and help recover braking energy. They may also be useful as secondary energy-storage devices in electric-drive vehicles because they help electrochemical batteries level load power.

Tesla Model S
Battery	100 kWh lithium ion Discontinued: 60 (40), 70, 75, 85 and 90 kWh lithium ion
Electric range	75 kWh (270 MJ) 249–259 mi (401–417 km) (EPA) 85 kWh (310 MJ) 253–272 mi (407–438 km) (EPA) 310 mi (500 km) (NEDC) 90 kWh (320 MJ) 270–294 mi (435–473 km) (EPA) 100 kWh (360 MJ) 348–402 mi (560–647 km) (EPA)

Charging your EV from empty can take as little as 20min or upard 40 depending on everything from the size of your particular car’s battery to where and when you decide to charge. First, it’s good to know the three levels of charging for EVs.

• Level 1: This is EV-speak for plugging the cord set that comes with your EV into a regular 120-volt outlet (the same kind you’d use for, say, a phone charger or a lamp). The gist is that this level of charging is slow—between 40 and 50 hours, if you’re charging from empty. Though it’s worth noting that, on average, us car owened by driver . So Level 1 may be enough for your daily needs or in a pinch to add some mileage.
• Level 2: This means you’re charging from a 220-volt outlet (the same kind that heavy-duty appliances like washers use) or hardwired equipment. In this scenario, you can charge from empty in about four to ten hours. Public Level 2 charging stations are common at locations where drivers tend to park, like workplaces or commercial parking lots, but most EV owners also get this version installed in their garage so they can charge overnight. A nice bonus: Some incentive could cover the cost of level 2
• Level 3: For the fastest charging speeds, you can turn to Level 3 chargers—also known as DCFC chargers or direct current fast chargers—which can charge your EV from empty in as little as 20 minutes. These public charging stations are more expensive to use, but they are particularly great for time-conscious road-trippers or urban drivers who can’t easily refuel at home. Plus, they’re getting faster. The first generation typically charged vehicles at 50kW, but the ones being installed today are generally at least three times as powerful, with some charging at 350kW.

Overall, there are a few other things to keep in mind. One, you’ll rarely charge your battery from completely empty to completely full. EV drivers are far more likely to “top off” their battery—making charging times quicker in practice. (In general, most manufacturers suggest keeping the battery’s charge in the range of 20 to 80 percent to extend its life.)

And, of course, not every car has the same battery capacity. General Motors’ 2022 all electric hummer , with its massive 212 kWh battery, could take hours longer to fully charge than the Chevy Bolt’s more modest 65-kWh battery. That said, Level 2 charging can generally charge even the biggest EV batteries overnight.

Additionally, not every battery can accept electricity at the same rate, a limitation that’s most relevant when it comes to Level 3 charging. The first generation of EVs was often only capable of charging at 50kW, so they cannot take advantage of the 350kW Level 3 charging stations that are increasingly the industry standard and which can provide hundreds of miles of range in about as much time as it takes to get a coffee and use the restroom.

What are the different types of EV plugs?

EVs have distinct charge ports, which are like outlets on the car. This means that the shape of the plug you connect to your EV varies as well. It’s important to know what plug your car uses, as not every public charging station will be compatible with every kind of plug.

For Level 1 and Level 2 charging, all EVs sold in the United States (besides Teslas) use a J1772 plug (also known as a J-plug). For speedy Level 3 DCFC, all U.S. EVs (again, besides Teslas) use either CCS (which stands for “combined charging system” and is the most common) or CHAdeMO plugs, depending on the brand of car. Teslas use the same proprietary plug for all levels of charging—including at Tesla Supercharger stations. They also come standard with a J1772 adapter.

How much does it cost to charge an electric car?

The average EV driver will spend 60% less on fueling cost compared to the average gas vehicle in their class. But electricity still isn’t free, and you’ll have to do a little math to determine what charging will run you.

Most EV owners regularly charge at home, which means the cost of electricity where you live and when you charge your car will determine your bill. To get a rough estimate of your monthly charging costs at home, multiply your car’s kwh 100mil rate(the EV equivalent of miles per gallon) by your electricity rate, which you can find on your utility bill. This will give you the electricity cost per 100 miles driven.

Note that charging your car overnight, when electricity demand and price drop, can save you as much as 30 percent. If you forgo charging at home and go with public charging stations, particularly the ultra-speedy DC fast chargers, you’ll be paying a premium.

But if you want to skip the math, know this: Charging at home is roughly the equivalent of fueling up on a according to NRDC senior attorney Max Baumhefner.