How Does an Electric Vehicle Work?

[LeSadie]

Electric vehicles operate on the principle that a battery supplies current, which is then regulated by a power controller to drive the motor's powertrain system, propelling the vehicle forward. An electric vehicle (BEV) refers to a vehicle that uses an onboard power source as its driving force, employs an electric motor to drive the wheels, and meets all the requirements of road traffic and safety regulations. For cars powered by fuel cells, the chemical reaction process in the fuel cell does not produce harmful byproducts, making fuel cell vehicles pollution-free. Moreover, the energy conversion efficiency of fuel cells is 2 to 3 times higher than that of internal combustion engines. Therefore, from the perspectives of energy utilization and environmental protection, fuel cell vehicles represent an ideal mode of transportation.

[VanEmersyn]

I've been driving an electric vehicle for over two years now, and the biggest takeaway is how quiet and cost-effective it is. Unlike gasoline cars that burn fuel, it relies on electricity from the battery pack to power the motor, which directly drives the wheels when activated. Plugging into a charging station feeds grid electricity into the large battery, a process as simple as charging a phone. The most fascinating part is the regenerative braking system that recaptures energy during deceleration, storing it back in the battery. For city driving, the electricity cost per 100 kilometers is just around ten yuan, significantly cheaper than refueling. However, it's important to note that batteries are sensitive to cold, with winter range typically reduced by about 20%, making models equipped with heat pump air conditioning more practical. Nowadays, long trips are also convenient, as a 30-minute fast charge at service areas can replenish over 300 kilometers of range.

[DiDylan]

Electric vehicles are actually much simpler in structure than fuel-powered cars, with just three core components: the battery pack, drive motor, and electronic control system. When you press the start button, the battery pack delivers DC power to the inverter through high-voltage lines, converting it into three-phase AC to create a rotating magnetic field in the motor's copper coils, which makes the rotor turn. This driving force is directly transmitted to the tires via a single-speed transmission. The electronic control system acts like a brain, constantly adjusting energy distribution and recovery ratios. The energy flow is clearly displayed on the central screen while driving—the smoother you drive, the lower the energy consumption. I often come across expert drivers who achieve just 5 kWh per 100 kilometers.

[SanWalker]

Last week, I took my child to the science museum, and the transparent electric car model in the exhibition area was particularly intuitive. The blue squares covering the chassis are lithium battery packs, and the small squares next to the four wheels are the motors. The docent explained that these thin battery cells are connected in series to form high voltage, which then powers the motors through the power module. The most interesting part is the energy conversion efficiency, which is as high as 80%, compared to just over 30% for fuel-powered cars. However, battery lifespan is the biggest concern for most people. Currently, mainstream automakers guarantee 8 years with 70% capacity retention, and ternary lithium batteries can generally withstand 2,000 charge-discharge cycles. For daily use, it's best to practice shallow charging and discharging to maintain battery health—I usually set my charging to stop at 90%.

[Daniel]

As a physics teacher, I always use the water dispenser as an analogy for electric vehicles to my students. The battery is like the water bottle, the motor is the water pump of the dispenser, and the wires are the water pipes. When you press the faucet (throttle), the pump pushes out water pressure (electric current) to drive the turbine (wheels) to rotate. The two mainstream solutions today are quite interesting: permanent magnet synchronous motors are compact and energy-efficient, while AC induction motors offer better high-speed performance. Electric vehicles eliminate the need for an air filter, but underbody protection is especially important, as stones hitting the battery pack could trigger thermal runaway. I recommend installing underbody armor for more peace of mind when driving through water on rainy days.

[SanMakayla]

Having repaired cars for over a decade, electric vehicles are much more hassle-free to maintain. No need for oil or filter changes during servicing—just mainly checking the sealing of high-voltage lines, with cabin air filters and brake pads wearing out much slower. Structurally, components like fuel tanks and exhaust pipes are eliminated, resulting in a lower center of gravity for better cornering stability. Charging power is also quite a science: a standard 7kW slow charger fills the battery overnight, while fast-charging stations can go up to 480kW, adding 200 kilometers in just five minutes. In summer, it's best to charge in underground parking to avoid high temperatures that trigger the vehicle's automatic power limitation to protect the battery. Pay attention to the braking system—although regenerative braking can substitute for conventional braking, the hydraulic system still requires regular checks.