Better Batteries

This week we talk about BYD, Tesla, and the Blade Battery 2.0.
We also discuss EVs, internal-combustion engines, and autonomous vehicles.
Recommended Book: Blank Space by W. David Marx
Transcript
Petroleum-powered vehicles, cars and trucks and SUVs of the kind that have become the standard since the mid-20th century, work by mixing fuel that you put in the tank when you fill up at the gas station with air, in the engine, and then creating a controlled explosion—in modern vehicles using what’s called a four-stroke combustion cycle of intake, compression, combustion, then exhaust—in order to move pistons which, in turn generate mechanical power by transferring that movement to the vehicle’s wheels.
An electric vehicle, in contrast, functions by using electricity from a battery pack to power an electric motor. So rather than needing fuel to combust, which then moves pistons which then moves the wheels, EVs are a straighter-shot with less conversion of energy necessary, electricity powering the motor which powers the wheels.
That simpler setup comes with many advantages, and that difference in the conversion of energy is a big one. Because most of the energy injected into the EV’s system is converted into mechanical movement for the wheels, this type of vehicle only loses about 11% of the energy you put into it to that conversion of electricity to mechanical energy process—around 31-35% is initially lost while charging, converting electricity to motion, and so on, but about 22% is recaptured by the vehicle’s brakes during operation, leading to that 11% average loss.
A gas-powered vehicle, in contrast, because of the inefficiencies inherent in converting fuel to combustion to movement, loses somewhere between 75-84% of the energy you put into it at the gas station, much of that loss in the form of heat that is emitted as a result of that conversion process; this is an inevitable consequence of the thermodynamics of burning fuel to create motion, and one that means operating a gas-powered vehicle is inherently lossier, in the sense that you can’t help but lose the majority of what you put into it as waste, compared to an electric vehicle, which is less lossy to begin with, but even more efficient when you include that in-operation energy recovery.
That baseline reality of energy usage means that modern electric vehicles will typically be cheaper to fuel, to power, because it requires less energy input to get the same amount of travel. This cost-benefit comparison shifts even further in favor of EVs when gas prices are high, though, and though currently the cost of EVs tend to be higher than gas-powered vehicles in most countries, EVs also offer substantially lower lifetime maintenance costs—an average of 40% lower than gas-powered vehicles, due largely to the dramatically reduced number of moving parts in EVs, and the lack of regular, recurring engine-related maintenance tasks, like oil changes and replacing spark plugs.
Not even considering the…