Otis Singleton
Electric vehicles (EVs) have become increasingly popular due to their environmental benefits and technological advancements. However, concerns about their safety in collisions have also grown. One primary concern is the potential risk posed by the vehicle's battery during and after a crash, including the risk of battery fires. Despite these concerns, electric vehicles are generally considered to be as safe as, if not safer than, traditional internal combustion engine (ICE) vehicles in crash tests. They are equipped with multiple safety features, and their heavier weight means they can absorb more impact in a crash. EVs must pass the same passive and active safety requirements as fossil fuel-powered vehicles, and their manufacturers are responsible for ensuring the safety of their occupants in the event of a crash. Crash test results from organizations like the Insurance Institute for Highway Safety and Euro NCAP have shown that electric vehicles can protect both occupants and pedestrians well and often receive high safety ratings.
| Characteristics | Values |
|---|---|
| Crash test speed | 40 mph (maximum collision speed for an EV) |
| 50 km/h (test vehicle and trolley) | |
| 56 km/h (two Mercedes-Benz EQA and EQS SUV vehicles) | |
| Weight | Electric vehicles are heavier than conventional cars |
| Average new car weight: 4,100 pounds | |
| Electric Hummer pickup: 9,100 pounds | |
| Electric Hummer SUV: 9,500 pounds | |
| Volvo EX90: 6,200 pounds | |
| Mercedes EQS: 6,000 pounds | |
| Tesla Model S: 4,800 pounds | |
| Safety | Electric vehicles are at least as safe as conventional vehicles |
| Electric vehicles have a lower risk of injury claims | |
| Electric vehicles have a small fire risk due to lithium-ion batteries | |
| Electric vehicles have multiple safety features to prevent battery-related accidents | |
| Electric vehicles have a higher risk of battery fires and electrocution | |
| Electric vehicles have a multi-stage high-voltage protection concept |
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What You'll Learn
- Crash test results show that electric vehicles are as safe as conventional vehicles
- EVs have a small fire risk due to their lithium-ion batteries
- The weight of electric vehicles absorbs much of the impact of a crash
- EVs must pass the same safety requirements as fossil fuel-powered vehicles
- The centre-of-gravity distribution affects the crashworthiness of converted electric vehicles
Crash test results show that electric vehicles are as safe as conventional vehicles
Crash test results have shown that electric vehicles are as safe as, if not safer than, conventional vehicles. The Insurance Institute for Highway Safety (IIHS), the best-known evaluator of vehicle safety, has found that electric vehicles are at least as safe as conventional cars, based on crash test performance and an analysis of injury claims. IIHS President David Harkey commented:
> We can now say with confidence that making the U.S. fleet more environmentally friendly doesn’t require any compromises in terms of safety.
IIHS has found that injury claims related to drivers and passengers in electric vehicles are over 40% lower than what was seen from conventional car occupants from 2011 to 2019. This is likely due to the greater weight of electric vehicles, which means that occupants of heavier vehicles are exposed to lower forces in multivehicle crash scenarios. Electric vehicles also tend to be more modern and high-tech, making it more likely that they will have the latest crash avoidance and survival technologies.
In addition, electric vehicles have never caught fire or experienced a thermal runaway as a consequence of being crash-tested by IIHS. This is despite stories of electric vehicles catching fire after collisions, which IIHS suggests is overblown given that there are over 170,000 combustion car fires each year.
Mercedes-Benz has also demonstrated that its electric vehicles are as safe as their conventional counterparts. In a recent crash test, two electric vehicles, the EQA and the EQS SUV, collided head-on with a 50% overlap, each travelling at 56 km/h. The crash test confirmed the engineers' calculations, showing that the vehicles were able to effectively absorb the energy of the collision by deforming, with the passenger safety cell of both electric models remaining intact and the doors still able to be opened.
Overall, crash test results have shown that electric vehicles are at least as safe as conventional vehicles, and in some cases may even offer improved safety due to their greater weight, lower centre of gravity, and newer safety technologies.
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EVs have a small fire risk due to their lithium-ion batteries
Electric vehicles (EVs) have been hailed as a more environmentally friendly alternative to traditional fossil fuel-powered cars. However, one concern that has been raised about EVs is their use of lithium-ion batteries, which can pose a small fire risk.
Lithium-ion batteries are vulnerable to swelling and are more susceptible to damage in crashes, which can lead to a greater risk of fire. This vulnerability is due to the use of organic liquid electrolytes, which are volatile and flammable when exposed to high temperatures. In the event of a crash, these batteries can also experience chemical leakage, making it challenging to pinpoint the exact cause of a fire.
While EV fires are not as common as those involving gas-powered vehicles, they are more difficult to extinguish. The batteries take a long time to cool down, creating a risk of reignition, and the battery chemistry poses challenges for firefighters. Despite these challenges, data shows that EVs are involved in fewer fires per 100,000 sold compared to both gasoline-powered and hybrid vehicles.
To address the fire risk associated with lithium-ion batteries, some manufacturers are exploring alternative battery chemistries. For example, Chinese company BYD Co produces EV battery cells that use lithium iron phosphate cathodes, which are less prone to catching fire. Other manufacturers, such as GM, are experimenting with nickel-cobalt-manganese-aluminum (NCMA) technology, which uses less cobalt, resulting in more stable and affordable cells.
While the fire risk associated with EVs is small, it is important for consumers to be aware of the potential hazards and to properly maintain their vehicles. Organizations like the National Fire Protection Association (NFPA) and Electrical Safety Foundation International (ESFI) offer resources and training to help first responders and consumers stay safe when dealing with EV battery fires.
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The weight of electric vehicles absorbs much of the impact of a crash
Electric vehicles (EVs) are generally heavier than conventional cars, and this additional weight plays a crucial role in crash safety. The weight of electric vehicles helps to absorb much of the impact during a collision, reducing the force transferred to the occupants. This is due to the deformation or "crushing" of the vehicle structure, which dissipates the kinetic energy of the crash.
The mass and center-of-gravity distribution of a vehicle influence its crashworthiness. Electric vehicles, with their smaller motors and batteries located underneath, tend to have a lower center of gravity than traditional cars. This lower center of gravity contributes to better stability and handling, which can also help prevent accidents.
While the weight of electric vehicles can provide safety benefits, it's important to consider the potential challenges. The increased weight of EVs may result in a higher risk of damage or injury in certain types of accidents, such as pedestrian collisions. Additionally, the weight distribution in EVs can be different from traditional cars due to the placement of batteries and other components, which may impact handling and crash dynamics.
To ensure the safety of electric vehicles, manufacturers conduct rigorous crash tests to evaluate their performance in various scenarios. These tests help engineers understand how the vehicle's structure, safety equipment, and battery systems perform during a collision. Organizations like the Insurance Institute for Highway Safety (IIHS) and Euro NCAP also provide independent evaluations of vehicle safety, including crash tests, to help consumers make informed choices.
In summary, the weight of electric vehicles does play a significant role in absorbing the impact of a crash, contributing to the overall safety of these vehicles. However, it is just one factor among many that influence the safety performance of EVs. Other factors include the design, safety features, speed, and angle of impact. As electric vehicles continue to evolve, it is crucial to consider the unique challenges and legal implications associated with accidents involving these vehicles.
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EVs must pass the same safety requirements as fossil fuel-powered vehicles
Electric vehicles (EVs) are subject to the same safety requirements as fossil fuel-powered vehicles. EVs must pass the same passive and active safety requirements as their fossil fuel counterparts, including type-approval regulations, self-certification requirements, and consumer standards such as Euro NCAP, US NCAP, or GlobalNCAP.
The Insurance Institute for Highway Safety (IIHS), a well-known evaluator of vehicle safety, conducts crash tests on EVs to ensure they meet the same safety standards as conventional cars. The IIHS found that injury claims related to drivers and passengers in EVs were over 40% lower from 2011 to 2019 compared to conventional car occupants, indicating that EVs are at least as safe, if not safer, than traditional vehicles.
In addition to crash tests, EVs and their components must meet rigorous testing standards specific to electric vehicles. For example, EV battery packs have their own testing protocols to ensure safety and reliability. EVs are also designed with safety features that automatically shut down the electrical system in the event of a collision or short circuit, further enhancing their safety.
While the testing procedures for EVs aim to ensure their safety, there are unique challenges associated with crashing an electric or hybrid vehicle. The weight and center-of-gravity distribution of EVs differ from traditional cars, which can affect their crashworthiness. Despite these differences, reputable car manufacturers like Mercedes-Benz are committed to ensuring that their electric vehicles meet the same high safety standards as their other models.
In summary, EVs must undergo comprehensive safety testing and adhere to the same safety requirements as fossil fuel-powered vehicles. This includes crash tests, battery pack testing, and the implementation of safety features to protect occupants and bystanders in the event of a collision.
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The centre-of-gravity distribution affects the crashworthiness of converted electric vehicles
Crash tests are a crucial aspect of vehicle safety, and electric vehicles (EVs) are no exception. In fact, EVs present unique challenges for crash testing due to their distinct characteristics, such as the placement of batteries and motors, which can affect the centre-of-gravity distribution. This distribution has a significant impact on the crashworthiness of converted EVs, and it is essential to understand how it influences their performance in collisions.
The centre-of-gravity distribution of a vehicle refers to the location of its centre of mass relative to its suspension. In EVs, the centre of gravity is typically lower than in conventional internal combustion engine (ICE) vehicles due to the smaller size of the motor and the placement of batteries underneath the vehicle. This lower centre of gravity can have both advantages and disadvantages in terms of crashworthiness.
One advantage of a lower centre of gravity is improved stability. EVs with a lower centre of gravity tend to have better handling and are less likely to roll over or lose control during cornering or abrupt manoeuvres. This improved stability can contribute positively to crash avoidance, as a more stable vehicle is less likely to be involved in a collision in the first place.
However, the lower centre of gravity in EVs can also have disadvantages in terms of crashworthiness. During a collision, the centre-of-gravity distribution influences the way the vehicle's frame deforms and absorbs impact energy. Axiomatic loads occur when the mass is straight to the frame, causing the frame to bend and change its eccentricity. The smaller size of the motor and the placement of batteries in EVs can result in a different deformation pattern compared to ICE vehicles, which can affect the overall crashworthiness.
The mass and distribution of weight in a vehicle also play a crucial role in crashworthiness. The mass of a vehicle can affect the severity of a collision, with heavier vehicles often resulting in more severe crashes. Additionally, the distribution of weight can impact the vehicle's ability to accelerate, decelerate, and manoeuvre, all of which are crucial factors in crash avoidance and mitigation.
In conclusion, the centre-of-gravity distribution has a significant impact on the crashworthiness of converted electric vehicles. A lower centre of gravity can provide improved stability and crash avoidance capabilities, but it can also influence the way the vehicle deforms and absorbs impact energy during a collision. Therefore, it is essential to consider the centre-of-gravity distribution when designing and testing EVs to ensure their safety and compliance with relevant regulations.
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Frequently asked questions
Yes, all electric vehicles have to be crash tested. They must pass the same passive and active safety requirements as fossil fuel-powered vehicles, including type-approval regulations, self-certification requirements, and consumer standards.
The Insurance Institute for Highway Safety (IIHS) is the best-known evaluator of vehicle safety. The maximum collision speed for an EV during crash tests is 40 mph.
Electric vehicles are generally considered to be as safe as, if not safer than, conventional vehicles in a crash. They have additional weight from their batteries, which helps to absorb the impact of a crash. They are also equipped with the latest crash avoidance and survival technologies.
One of the primary concerns with electric vehicles is the potential risk posed by the vehicle's battery during and after a crash. Incidents involving battery fires have garnered significant attention, and determining liability in these cases can be challenging.
