High-accuracy electric vehicle battery monitoring with diamond quantum sensors for driving range extension toward carbon neutrality. The popularity of electric vehicles (EVs) as an environmentally friendly alternative to conventional vehicles with gasoline-powered internal combustion engines has
A diamond quantum sensor-based detection technique can more accurately estimate battery charge, leading to an extended range for electric vehicles.electric vehicle battery monitoring with diamond quantum sensors for driving range extension toward carbon neutrality.
Typically, the battery currents in EVs can reach hundreds of amperes. However, commercial sensors that can detect such currents cannot measure small changes in the current at milliampere levels. This leads to an uncertainty of around 10% in the battery charge estimation. What this means is that the driving range of EVs could be extended by 10%. This, in turn, would reduce inefficient battery usage.
measured currents in a wide range as well as detected milliampere-level currents in a noisy environment,” explains Prof. Hatano. Next, the team of scientists used a mixed analog-digital control of the frequencies generated by two microwave generators to trace the magnetic resonance frequencies of the quantum sensor over a bandwidth of 1 gigahertz. This allowed for a large dynamic range of ±1000 A. Moreover, a wide operating temperature range of − 40 to + 85 °C was confirmed to cover general vehicular applications.
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