Diamond quantum sensor extends EV driving range

Not knowing exactly how much juice is left in your electric vehicle’s battery pack isn’t merely anxiety inducing, it limits range. After all, if the onboard sensors can’t give you an exact range, you better err on the side of caution.

This is a very real problem even for modern electric vehicles (EVs). The charge state of an EV battery is measured based on the current output of the battery, which in turn is used to estimate the vehicle’s remaining driving range. At the moment, a 10 percent margin is necessary because commercially available current sensors aren’t accurate enough: about 1 ampere is state-of-the-art and the average battery-current output is 10 amperes.